كتاب الفرع والعتيرة
Read the English translation first, with the original Arabic directly underneath.
It was narrated from Abu Sa'eed Al-Khudri that the Prophet (ﷺ) said:
"If a fly falls into the vessel of one of you, let him dip it in,"
إِذَا وَقَعَ الذُّبَابُ فِي إِنَاءِ أَحَدِكُمْ فَلْيَمْقُلْهُ