he was praying and a son a Marwan wanted to pass in front of him. He tried to stop him but he did not go back, so he hit him. The boy went the boy went out crying and went to Marwan and told him (what had happened). Marwan said to Abu Sa'eed: "Why did you hit your brother's son?" He said: "I did not hit him, rater I hit the Saitan. I heard the Messenger of Allah say: 'If one of you is praying and someone wants to pass in front of him, let him troy to stop him as much as he can, and if he persists then let him fight him, for he is a devil.