Night of 15th Rajab
According to narrations, there are many rites to be performed on the 15th (i.e. middle) night of Rajab:
One may then pray for their legitimate desires.
Sayyid Ibn Tawus has narrated this prayer in this form from Imam Ja’far al-Sadiq (عليه السلام) although Shaykh al-Tusi, in Misbah al-Mutahajjid, has mentioned that Dawud ibn Sarhan narrated that Imam Ja’far al-Sadiq(عليه السلام) said the following:
On the 15th night of Rajab, you may offer a twelve rakat prayer in each rakat of which you may recite Surah al-Fātiḥah and any other Surah. When you finish, you may recite Surah al-Fātiḥah, al-Falaq, al-Nas, al-Tawḥīd, and Ayah al-Kursi each four times. After that, you may recite the following 4 times:
Then, you may recite the following:
The same prayer may be offered at the twenty-seventh night of Rajab.
Day of 15th Rajab
On this blessed day, the following rites are recommended:
It is recommended to begin with offering the famous Salat Salman (The Prayer of Salman al-Farsi), which consists of thirty rakat. On the first of Rajab, it is advisable to offer ten units of this prayer separating each couple with a Taslim. In each unit, one should recite Surah al-Fātiḥah one time, Surah al-Tawḥīd three times, and Surah al-Kafirun three times. After Taslim, it is recommended to raise the hands up and recite the following:
The following invocation should be recited thereafter:
Then, one should pass the hands over the face.
Other ten units of this prayer should be offered on the fifteenth (i.e. middle) of Rajab in the very aforementioned form. However, the following invocation should be added after the first one:
The last ten units of this prayer should be offered on the last day of Rajab in this very form; rather, the following invocation is added after the first one:
Then, one should pass the hands over the face and submit his requests.
This greatly beneficial prayer must not be neglected. However, Salman has another prayer, to be offered on this day, which consists of ten units in each of which Surah al-Fātiḥah should be recited once and Surah al-Tawḥīd three times. This prayer brings about a great reward; it achieves forgiveness of all sins, protects against the grave torture and the chastisement on the Resurrection Day, and saves from leprosy, elephantiasis, and pleurisy.
According to a narration, any aggrieved person who recites this supplication will have his grief removed by Almighty Allah.