What did the Prophet Muhammad (peace be upon him) say about someone trying to pass in front of you while you were praying behind something as a sutra?
 Narrated Abu Sa`id:                     The Prophet said, (what is ascribed to him in the following Hadith):Narrated Abu Salih As-Samman:I saw Abu Sa`id Al-Khudri praying on a Friday, behind something which acted as a Sutra. A young man from Bani Abi Mu'ait [??] , wanted to pass in front of him, but Abu Sa`id repulsed him with a push on his chest. Finding no alternative he again tried to pass but Abu Sa`id pushed him with a greater force. The young man abused Abu Sa`id and went to Marwan and lodged a complaint against Abu Sa`id and Abu Sa`id followed the young man to Marwan who asked him, "O Abu Sa`id! What has happened between you and the son of your brother?" Abu Sa`id said to him, "I heard the Prophet saying, 'If anybody amongst you is praying behind something as a Sutra and somebody tries to pass in front of him, then he should repulse him and if he refuses, he should use force against him for he is a Shaitan (a Satan).' "