Sunan Abi Dawud 73
سنن أبي داود#73SahihNarrated Abu Hurairah : The Prophet (sal Allaahu alayhi wa sallam) as saying : When a dog licks a (thing contained in a) utensil you must wash it seven times, using earth (sand) for the seventh time. Abu Dawud said : This tradition has been transmitted by another chain of narrators in which there is no mention of earth
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniShadh
Muhammad Muhyi Al-Din Abdul HamidShadh
Shuaib Al ArnautSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 1:73