It was narrated that Abu Razin said:
'I saw Abu Hurairah hitting his forehead with his hand and saying: "O people of Iraq! Do you claim that I would tell a lie against the Messenger of Allah so that it may be more convenient for you and a sin upon me?' I bear witness that I heard the Messenger of Allah say: 'If a dog licks the vessel of anyone of you, let him wash it seven times.'" (TR)
English reference (TR): Vol. 1, Book 1, Hadith 363 (TR)
Arabic reference (TR): Book 1, Hadith 393 (TR)