Sunan an-Nasa'i 4262
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ، قَالَ حَدَّثَنِي سَعِيدُ بْنُ خَالِدٍ، عَنْ...
It was narrated from Abu Sa'eed Al-Khudri that the Prophet said:"If a fly falls into the vessel of one of you, let him dip it in