Hadithcore
Sunan an-Nasa'i, 1918
sahih· Darussalam

It was narrated that Abu Hurairah and Abu Sa'eed said:

"We never saw the Messenger of Allah attend any funeral where he sat down until (the body) was placed (in the grave)."

أَخْبَرَنَا يُوسُفُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَجَّاجٌ، عَنِ ابْنِ جُرَيْجٍ، عَنِ ابْنِ عَجْلاَنَ، عَنْ سَعِيدٍ، عَنْ أَبِي هُرَيْرَةَ، وَأَبِي، سَعِيدٍ قَالاَ مَا رَأَيْنَا رَسُولَ اللَّهِ صلى الله عليه وسلم شَهِدَ جَنَازَةً قَطُّ فَجَلَسَ حَتَّى تُوضَعَ ‏.‏

References2 variants
In-Book Reference
Book 21, Hadith 101
English Reference
Vol. 3, Book 21, Hadith 1919