Mishkat al-Masabih #1604
Funerals
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ سَعِيدِ بْنِ الْمُسَيَّبِ قَالَ: صَلَّيْتُ وَرَاءَ أَبِي هُرَيْرَةَ عَلَى صَبِيٍّ لَمْ يَعْمَلْ خَطِيئَةً قَطُّ فَسَمِعْتُهُ يَقُولُ: اللَّهُمَّ أَعِذْهُ مِنْ عَذَابِ الْقَبْر. رَوَاهُ مَالك
Sa'id b. al-Musayyib said he prayed behind Abu Huraira at the funeral of a boy who had never sinned and heard him say, “O God, protect him from the punishment in the grave.”
Malik transmitted it.
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About Mishkat al-Masabih
This hadith is #1604 from Mishkat al-Masabih, in the Book of Funerals.