Bulugh al-Maram, Book 1, Hadith 11 (In-Book)

Narrated Abu Huraira (rad): Narrated by Abu Huraira (rad): Allah’s Messenger said: “The cleansing of the utensil belonging to one of you, after it has been licked by a dog, is to wash it seven times, and using soil for cleaning at the first time.” [Muslim reported it].

وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ طَهُورُ إِنَاءِ أَحَدِكُمْ إِذْ وَلَغَ فِيهِ اَلْكَلْبُ أَنْ يَغْسِلَهُ سَبْعَ مَرَّاتٍ, أُولَاهُنَّ بِالتُّرَابِ } أَخْرَجَهُ مُسْلِمٌ (15)‏.‏ ‏2 ‏- صحيح.‏ رواه مسلم (279)‏ (91)‏.‏

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also referenced under: Book 1, Hadith 12 (English)