Muwatta Imam Malik (Riwayat Yahya)

It is narrated from Sayyiduna Abu Huraira (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When a Muslim servant begins ablution – or a believer – then washes his face, the sins that his eyes committed by looking are washed away from his face with the water, or with the last drop of water. Then when he washes his hands, the sins that his hands committed by touching are washed away from his hands with the water, or with the last drop of water. Then when he washes his feet, the sins that his feet committed by walking are washed away with the water, or with the last drop of water. Until he comes out purified from sins."