Sunan an-Nasa'i, Volume 3, Book 21, Hadith 2003 (DarusSalam) ⓘ

It was narrated that Al-Bark' said: "We went out with the Messenger of Allah for a funeral, and when we reached the grave the Lahd had not yet been prepared. He sat, and we sat around him, as if there were birds on our heads."

أَخْبَرَنَا هَارُونُ بْنُ إِسْحَاقَ، قَالَ حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ، عَنْ عَمْرِو بْنِ قَيْسٍ، عَنِ الْمِنْهَالِ بْنِ عَمْرٍو، عَنْ زَاذَانَ، عَنِ الْبَرَاءِ، قَالَ ‏:‏ خَرَجْنَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي جَنَازَةٍ، فَلَمَّا انْتَهَيْنَا إِلَى الْقَبْرِ وَلَمْ يُلْحَدْ، فَجَلَسَ وَجَلَسْنَا حَوْلَهُ كَأَنَّ عَلَى رُءُوسِنَا الطَّيْرَ ‏.‏