Mishkat al-Masabih #267

Abu Huraira reported God’s messenger as saying, “When a Muslim, or a believer, washes his face in the course of ablution, every sin he contemplated with his eyes will come forth from his face along with the water, or with the last drop of water; when he washes his hands, every sin they wrought will come forth from his hands with the water, or with the last drop of water; and when he washes his feet, every sin towards which his feet have walked will come out with the water, or with the last drop of water, with the result that he will come forth pure from offences.” Muslim transmitted it.