حِصْنُ الْمُسْلِمِ
Hisn al-Muslim 164
Fortress of the Muslim (Hisn al-Muslim)
After burying the deceased
اللَّهُمَّ اغْفِرْ لَهُ اللَّهُمَّ ثَبِّتْهُ
Allāhumma’ghfir lah Allāhumma thabbit’h. O Allah, forgive him. O Allah, strengthen him. Reference: The Prophet (ﷺ) used to stop after burying the dead and say to the people: "Ask Allah to forgive your brother and pray for him to be strengthened, for indeed he is now being questioned." Abu Dawud 3/315, and Al-Hakim 1/370 who graded it authentic and Ath-Thahabi agreed.
Hisn al-Muslim, 164