مسند أحمد

It was narrated that Humran said. `Uthman (رضي الله عنه) did ghusl every day since he became Muslim. I brought water for him one day to do wudoo’ for prayer. After he did wudoo’, he said: I wanted to tell you a hadeeth that I heard from the Messenger of Allah (ﷺ). Then I decided not to tell it to you, al-Hakam bin al-`As said: O Ameer al-Mu`mineen, if it is enjoining us to do good we will do it and if it is warning us of a bad thing we will avoid it. He said: I will tell it to you the Messenger of Allah (ﷺ) did wudoo in this manner, then he said: `Whoever does wudoo’ in this manner and does it well, then goes and prays, bowing and prostrating properly, it (the prayer) will expiate his sins between that - prayer and the next, unless he does or something serious` i.e., major sin.