Mishkat al-Masabih, hadith 1627

وَعَنِ الْبَرَاءِ بْنِ عَازِبٍ قَالَ: خَرَجْنَا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي جَنَازَة رجل من الْأَنْصَار فَانْتَهَيْنَا إِلَى الْقَبْر وَلما يُلْحَدْ بَعْدُ فَجَلَسَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مُسْتَقْبِلَ الْقِبْلَةِ وَجَلَسْنَا مَعَهُ. رَوَاهُ أَبُو دَاوُدَ وَالنَّسَائِيُّ وَابْنُ مَاجَهْ وَزَادَ فِي آخِرِهِ: كن على رؤوسنا الطير

Al-Bara’ b. ‘Azib said, “We went out with God’s messenger to the funeral of a man of the Ansar, but when we reached the grave the niche in the side had not yet been made, so the Prophet sat down facing the qibla and we sat down along with him.” Abu Dawud, Nasa’i and Ibn Majah transmitted it, Ibn Majah adding “quietly”. (Literally, as though the birds were over our heads. An explanation of the phrase is that when a bird alights on a camel’s head and begins to pick the ticks off it, the camel stands perfectly still so as not to frighten it away.)