Al-Kāfi

Hadith 710
funeral-prayerdua
2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عُمَرَ بْنِ أُذَيْنَةَ عَنْ فُضَيْلِ بْنِ يَسَارٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ الْسَّلام) قَالَ إِذَا صَلَّيْتَ عَلَى الْمُؤْمِنِ فَادْعُ لَهُ وَاجْتَهِدْ لَهُ فِي الدُّعَاءِ وَإِنْ كَانَ وَاقِفاً مُسْتَضْعَفاً فَكَبِّرْ وَقُلِ اللهمَّ اغْفِرْ لِلَّذِينَ تَابُوا وَاتَّبَعُوا سَبِيلَكَ وَقِهِمْ عَذَابَ الْجَحِيمِ.
2. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from ‘Umar ibn ’Udhaynah from Fudayl ibn Yasar who has said the following: “Abu Ja‘far (a.s.), has said, ‘When you perform Salah (prayer) for a believing person, pray for him and strive in your appeal in favor of the deceased person. If he is of those who keep matters on hold (of waqifiy belief) or of weak understanding say, ‘Takbir (Allah is great beyond description) and, O Lord, forgive those who have repented, followed your path and protect them against the suffering of the hell fire.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī