Musnad Ahmad

Humran reports that once Sayyiduna Uthman (may Allah be pleased with him) was sitting on a bench, he asked for water, first poured it on his left hand, then put his hand in the vessel and washed both hands three times, then washed his face three times, rinsed his mouth and put water in his nose, washed his arms including the elbows three times, then wiped his head and washed his feet including the ankles three times, and said: I heard the Messenger of Allah (peace and blessings be upon him) say that whoever performs ablution like this of mine and then offers two units of prayer without letting thoughts and distractions enter his heart, Allah Almighty will forgive all his past sins.