Muwatta Malik, Book 16, Hadith 557 (In-Book)

Yahya related to me from Malik from Abu Bakr ibn Uthman ibn Sahl ibn Hunayf that he had heard Abu Umama ibn Sahl ibn Hunayf say, "We used to attend funeral processions, and the last of the people would not sit until they had been given permission."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي بَكْرِ بْنِ عُثْمَانَ بْنِ سَهْلِ بْنِ حُنَيْفٍ، أَنَّهُ سَمِعَ أَبَا أُمَامَةَ بْنَ سَهْلِ بْنِ حُنَيْفٍ، يَقُولُ كُنَّا نَشْهَدُ الْجَنَائِزَ فَمَا يَجْلِسُ آخِرُ النَّاسِ حَتَّى يُؤْذَنُوا ‏.‏

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also referenced under: Book 16, Hadith 35 (USC-MSA)