Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Amr bin Abasah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "When a person washes his hands while performing ablution, the sins committed by his hands are washed away; when he washes his face, the sins of the face are washed away; when he washes his arms and wipes his head, the sins of the arms and head are washed away; and when he washes his feet, all the sins committed by his feet are forgiven."