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The Prophet (ﷺ) said: When you pray over the dead, make a sincere supplication for him.

"I heard the Messenger of Allah (ﷺ) offering the (funeral) prayer for one who had died, and I heard him say in his supplication: 'Allahummaghfir lahu warhamhu wa 'afihi was a'fu 'anhu, wa akrim nuzulahu wa wassi' ,adkhalahu waghsilhu bil-ma

"I heard the Messenger of Allah offer the funeral prayer and say: Allahumma ighfir lahu warhamhu wa`fu `anhu wa `afihi, wa akrim nuzulahu wa wassi` mudkhalahu waghsilhu bi-ma'in wa thaljin wa-barad, wa naqqihi min al-khataya kama yunaqqa at

“I heard the Messenger of Allah (ﷺ) say: ‘When you offer the prayer for the deceased, supplicate sincerely for him.’”

The Messenger of Allah (ﷺ) offered a funeral prayer and I memorized his supplication. He (ﷺ) prayed: "Allahummaghfir lahu, warhamhu, wa 'afihi, wa'fu 'anhu, wa akrim nuzulahu, wa wassi' mudkhalahu, waghsilhu bil-ma'i wath-thalji wal-baradi,

I heard the Messenger of Allah (ﷺ) saying: "When you pray over the dead, make a sincere supplication for him." <b>[Abu Dawud]</b>.

“If you offer the funeral prayer for a deceased person, supplicate Allah sincerely for him." Related by Abu Dawud.