Rajab is one of the four months declared sacred by Allah (SWT) in the Glorious Qur'an.

Hadeeth regarding Prayers and Aa'mal of Month of Rajab al-Murajab

Holy Prophet Muḥammad  al Mustafā (S.A.W.W) said:

 "...Know that if a faithful person fasts (in month of Rajab) seeking reward from Allāh he has gained lots of pleasure of Allāh  The fast of that person would end the anger of Allāh upon him; a door of Hell would be closed for him. The reward of this fast with pure intention is better than giving an earth filled with gold as charity. No object in this world can make his reward complete except good deeds. As soon as night falls, Allāh would fulfill his ten wishes. If he prays for worldly life his prayers would be accepted. One who prays for His friends, lovers and chosen people, Allāh would accept his prayers..."

[Reference: Sawaabul A’amaal & Iqaabul A’amaal, Page 85- 86 ]

Imām Mūsā ibn Ja‘far al-Kāzim (A.S.) said:

"Rajab is a glorious month. Allāh doubles good deeds and wipes the sins in this month. One who observes one fast in Rajab, Hell would go away from him to a distance of a year and Paradise would be made obligatory on one who fasts for three days.”

[Reference: Sawaabul A’amaal & Iqaabul A’amaal, Page 85 ]

Imām Mūsā ibn Ja‘far al-Kāzim (A.S.) said:

 "Rajab is a river of Paradise whiter than milk and sweeter than honey. One who observes one fast in the month of Rajab, Allah, the Mighty and Sublime would satisfy him with this river."

[Reference: Sawaabul A’amaal & Iqaabul A’amaal, Page 84 ]

Holy Prophet Muhammad al Mustafā (S.A.W.W) said:

“One who observes two fasts in the month of Rajab nothing in the earth and heavens can imagine the greatness of that person. He would get the reward of a truthful person who has never lied in his whole life-time. He would appear on the Day of Judgment in the similar state. That person would do intercession of others along with other truthful people till they all enter Paradise and settle down with those truthful persons."

“One who fasts for three days in Rajab, Allāh (s.w.t.) would erect a barrier between him and Hell whose distance would be equal to travel of seventy years. Allāh  (s.w.t.) would say at the time of Iftar, ‘You have right upon Me and My love for you has become obligatory. O angels! I hold you witness that I have forgiven his sins from start till the end"

“One who fasts for four days in the month of Rajab, he will remain safe from calamities like the evils of Jinns, leprosy, leucoderma, mischief of Dajjal and the punishment of grave. He would get the reward of wise persons who repent. He would be handed over the scroll of deeds in his right hand and made to stand in the first row of worshippers"

“One who fasts for five days in the month of Rajab it is the duty of Allāh(s.w.t.) to please him on the Day of Judgment. His face would be shinning like the full moon when he is resurrected on the Day of Judgment. Rewards equal to the number of grains of sand would be written for him and he would be made to enter Paradise without any accounting. He would be given choice to ask whatever he wants from Allāh(s.w.t.)"

“One who fasts for six days in the month of Rajab, his face would be brighter than sun when he is resurrected on the Day of Judgment. Apart from this, he would be given extra light, which would light up all those gathered on that day. He would be gathered along with protected people and would pass through the Sirat Bridge without any accounting. His sins as great as disobeying parents and breaking relations will be forgiven."

“One who fasts for seven days in the month of Rajab, Allah would close all seven doors of Hell for him and prohibit the fire of Hell for his body."

“One who fasts for eight days in the month of Rajab, Allāh (s.w.t.) would open all eight doors of Paradise for him one by one and he would be given choice to enter Paradise from whichever door he wishes."

"One who fasts for nine days in Rajab would come out of his grave saying Laa ilaaha illallaah and would not see anything except Paradise. The light of his face would brighten the people gathered on that day and people would think of him as a prophet. The minimum reward given to him at that time is entrance to Paradise without any accounts"

"One who fasts for ten days in Rajab would be given two emerald wings decorated by illuminating pearls and rubies. He would enter Paradise flying over the Sirat Bridge with the help of these wings. He would be counted among the just and dear ones of Allāh (s.w.t). He is like one who prayed for a hundred years with the pure intention of seeking reward from Allāh (s.w.t)"

One who fasts for fourteen days in Rajab, Allah would grant him huge palaces made of pearls and rubies of such kind that eyes have neither seen nor ears heard about nor can a human mind imagine them. One who fasts for fifteen days in Rajab would stand at the place of faithful people. Every angel, messenger and apostle passing by him would say, ‘Congratulations, for you are in peace, near to Allah, honest, fortunate and happy and would rest in gardens.”

"One who fasts for sixteen days in Rajab would be among those who are first to ride upon the vehicles of bright light. He would fly from Paradise to the door of Mercy in these vehicles. One who observes seventeen fasts in Rajab, seventy thousand lamps would be illuminated for him at the Sirat Bridge so that he enters Paradise passing the bridge in the light of these lamps. Angels would welcome him saying, ‘Well done’ and ‘Peace be upon you"

[Reference: Sawaabul A’amaal  Page 86, 87, 88]

Imām Muhammad ibn ‘Alī al-Bāqir (A.S.) said:

“One who fast in the month of Rajab, for a day in its starting  or in its middle or in its last (days), Allah (s.w.t) will make incumbent upon him the Heaven, and He will keep him with us in our stages on the day of Resurrection, and one who fast two days in the month of Rajab, it will be said to him, start doing action from the start as your sins of past have been forgiven, and one who fast for the three days from the month of Rajab, it will be said to him that all your past sins have been forgiven and those which to remain, so do intercession of whom you wish to from the sinful once among your brothers and to whom you know, and one who fast for the seven days in the month of Rajab, the seven door of hell will closed for him, and one whofast for the eight days in the month of Rajab, then seven door of heaven will be open for him, so he can enter into it from which door he wishes."

[Reference: A’maali Al – Sudooq, Page. 6]

Imām Ja'far ibn Muhammad al-Sādiq (a.s.) said:

"In Rajab one who fasts for seven days all the seven doors of Hell would be closed for him. One who fasts for eight days all eight doors of Paradise would be opened for him. One who fasts for fifteen days would have his problems solved. One who fasts for more than this Allāh, the Mighty and Sublime would grant him a greater reward.”

[Reference:  Sawaabul A’amaal, page no. 84]

Imām Alī ibn Mūsā al-Rezā (A.S.) said:

“Whoever fast on the first day of the month of Rajab, with desire for the reward of Allāh the Almighty, (then) heaven is incumbent for him and whoever fast in the middle of it (Month of Rajab) he can intercedes people that of Tribe Rabi’a and Mudur. Whoever fast on the last day of it (Month of Rajab) Allāh will make him the kings of the heaven and he will intercedes for his father, mother, sons, daughters, brothers, sisters, paternal uncle, paternal aunt, maternal uncle, maternal aunt, his known ones and neighbors, even if anyone of them are deserving of fire of hell."

Fasting on the 24th of Rajab carries great reward (Sawab). One of it's merits is that when the Angel of death comes to remove his spirit (Rooh), he comes in the form of a handsome youth carrying a bowl of the pure drink (Sharabe Tahoora) and offers him to drink. The dying person does so and dies in peace.

[Reference: Manazelul Akherah, chapter 1]

Imām Alī ibn Mūsā al-Rezā (A.S.) said:

“The Almighty Allāh appointed Muhammad (s.a.w.w.) as His Apostle when three nights were left in the month of Rajab . Hence observing fast on this day has reward equal to fasting seventy years.”

[Reference:  Sawaabul A’amaal, page 91, narrated by Saad bin Abdullah]

Imām Ja'far ibn Muhammad  al-Sādiq (A.S.) answered:

"Listen Salim, if one observes fasting on the last day of this month, this will secure him against the agonies of death, the horror of the resurrection and the torture in the grave. As for one who observes fasting on the last two days of this month, this will give him permission to pass the path (Sirāt) peacefully.. and  as for one who observes  fasting one the last three days of the month, he shall be secured on the Grand Horror day against all horrors and hardships thereon, and shall be also granted release from hell fire.”

[Reference: The Rites of Rajab, Sha'ban & Ramadan page 47- 48, Ibn babawayh quoted Salim]

Someone asked, “O" Messenger of Allāh! What should a person do who is not able to observe fast for the whole month due to weakness, menstruation or some other reason?”

Holy Prophet Muhammad al Mustafā (S.A.W.W) said:

 “They should give food to poor as charity. I swear by Him in whose control is my life that they would get much more than what I have said if they give charity daily. All the creatures of this earth and the heavens cannot even estimate one-tenth of the reward, which that person would get in Paradise.” Someone asked, “O Messenger of Allāh! What should a person do who is not able to pay charity also?” The Holy Prophet (s.a.w.w.) said, “He should recite the following Tasbeeh of Allāh a hundred times daily for thirty days in the month of Rajab:

‘Sub-h’aanal ilaahil jaleeli sub-h’aana mallaa yambaghit tasbeeh’u illaa lahu sub-h’aanal a-a’zzil akrami sub-h’aana man labisal i’zza wahuwa lahu ahl’."

[Reference: Sawaabul A’amaal & Iqaabul A’amaal, Page 91] 

“Almighty Allāh will forgive all the sins of those who offers a ten rak'at prayer, at one night in Rajab, reciting in each rakah the surah of Al Fatihah once and repeating the surah of Tawheed three times.”

 
[Reference: The Rites of Rajab, Sha'ban & Ramadan, page 68].

Holy Prophet Muhammad al Mustafā (S.A.W.W) said:

"One who prays the 4 units of Namaz (detailed below) in Rajab on Friday between Zohr and Asr will from the day he prays to the day of one’s death, 1000 good deeds will be accorded to him Daily. And for every Ayat will be awarded a town (City) of red Yaqut (Ruby) in Jannat and for every letter (Harf) he will be awarded a Villa of white pearls in Jannat. We will be married to Hurulain and Allah will be pleased with him and eternally he will be counted among the Pious (Abideen) and his end will be with (divine) help and forgiveness".

4 Rak'at Salat (2 X 2) : In each Rakat recite

1.Sura-e-Fateha - 1 time

2. Ayatal Qursi - 7 times

3. Sura-e-Tawheed - 5 times

After the namaz say. - 10 times

.أَسْتَغْفِرُ اللّه وَأَسْأَلُهُ التَّوْبَةَ . 4

Astaghfirullahalazi lailaha illa hua wa as alahut taubata

[Reference : Mafatih al Jinan]

 
Holy Prophet Muhammad al Mustafā (S.A.W.W) said:

"If a person recites four unit (Rak’at) Namaz on the night of 7th Rajab in a manner that in each unit (Rak’at) after Surah-al-Hamd recites thrice Surah-at-Tawheed, once Surah-al-Falaq, and once Surah-an-Naas. After finishing the Namaz, sends ‘Salawat’ on us and recites ten times Tasbeehate Arba’,

Almighty Allāh will offer him shelter under the Throne (Arsh), and give him reward of a person fasting in the month of Ramazan. Till the time he finishes the prayers, the Angels pray for his forgiveness. Allah will ease the pangs of death on him, and save him from the squeeze in the grave (Fishare Qabr). He will not die until he sees his place in Paradise, and will be safe from the hardships of Resurrection (Qiyamat)"

[Reference: Manazelul Akherah, Chapter 1]