Sahih Ibn Khuzaymah

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "When any Muslim or believing servant performs ablution, and washes his face, then with the water or with the last drop of water, all the sins which he committed with his eyes are washed away from his face. Then when he washes his hands, with the water or with the last drop of water, all the sins which his hands committed are washed away from his hands. Then when he washes his feet, with the water or with the last drop of water, all the sins to which his feet walked are washed away from his feet, until he becomes purified from sins."