Musnad Abu Ya'la al-Mawsili 245:9

Abu Hammam narrated to us, Al-Walid ibn Muslim narrated to us, from Abd al-Rahman ibn Yazid ibn Jabir, who said: I heard Abu Abd Rabb say: I heard Muawiyah say: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, deeds are only by their endings, like a vessel; if its top is good, its bottom is good, and if its top is corrupt, its bottom is corrupt."