Mukhtasar Bukhari

In one narration, it is reported from Hudhaifa (may Allah be pleased with him) that (when the Messenger of Allah, peace and blessings be upon him, once urinated behind a wall), I moved away from him, so the Messenger of Allah, peace and blessings be upon him, signaled to me. Thus, I went to him and stood behind him (that is, behind his back) until the Messenger of Allah, peace and blessings be upon him, finished (urinating).