Sayyiduna Abu Huraira (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) led us in the Zuhr prayer. A man in the last row did not perform the prayer properly. When the Prophet (peace and blessings be upon him) finished the prayer with salam, he said to him: "O so-and-so! Do you not fear Allah? How do you perform the prayer? Do you think that what you do is hidden from me? By Allah! Just as I see in front of me, I also see behind me."