Abu Huraira told how on an occasion when Allah's Messenger ﷺ led them in the noon prayer, there was a man at the back of the rows who performed the prayer badly. When he had said the taslim Allah's Messenger ﷺ called out to him, “So and so, do you not fear Allah? Do you not see how you should pray? You people think that part of what you are doing is hidden from me, but I swear by Allah that I see behind me just as I see in front of me." Ahmad transmitted it.