It is narrated from Ibrahim ibn Abi al-Bilad, who said: I asked Abu al-Hasan, meaning Imam Musa ibn Jafar Al-Kadhim عليه السلام: "What is the reward for one who prays the Salat of Ja'far?" Imam عليه السلام said: "If they have sins equal in quantity to the sand of 'Alij and the foam of the sea, Allah سبحانه وتعالى would forgive them." I asked: "Is this exclusively for us?" Imam عليه السلام said: "For whom else would it be if not for you specifically?" I then asked: "Which chapters (of the Qur'an) should be recited in it?" Imam عليه السلام answered: "Recite 'When the Earth is Shaken with its [Final] Earthquake' (Surat al-Zalzalah), 'When the Victory of Allah سبحانه وتعالى has Come' (Surat al-Nasr), 'Indeed, We sent it down during the Night of Decree' (Surat al-Qadr), and 'Qul Huwa Allahu Ahad' (Surah Al-Ikhlas)."