The Sutrah and Its Obligation
He ﷺ would stand close to his sutrah: the distance between him and the wall was three cubits, and between his place of prostration and the wall there was room for a sheep to pass. He used to say, “Do not pray except toward a sutrah, and do not allow anyone to walk in front of you; if he insists, then fight him, for a companion (a devil) is with him.” He also said, “When one of you prays toward a sutrah, let him draw near to it so that Satan will not cut off his prayer.”
At times he deliberately chose to pray beside the pillar in his mosque. Whenever he prayed in open space [where nothing stood to screen him], he would plant a spear in front of him and pray facing it, with the people lined up behind him. On other occasions he would turn his riding camel sideways and pray toward it—this is unlike praying in camel enclosures, which he forbade. Sometimes he would take his saddle, set it upright, and pray toward its rear, and he said, “When one of you places before him something like the back of a saddle, let him pray and not worry about whoever walks beyond that.” He once prayed facing a tree, and at times he prayed toward the bed while ʿĀʾishah—may Allah be pleased with her—was lying on it beneath her blanket.
He ﷺ never let anything pass between him and his sutrah. Once, while he was praying, a sheep rushed toward him; he drove it off until he pressed his stomach against the wall and it passed behind him. On another occasion he led an obligatory prayer and clasped his hand; when he finished they asked, “Messenger of Allah, has something new occurred in the prayer?” He replied, “No, but Satan tried to pass in front of me, so I throttled him until I felt the coolness of his tongue on my hand. By Allah, had my brother Solomon not already beaten me to it, he would have been tied to one of the pillars of the mosque so that the children of Medina could walk around him. So whoever can keep anything from coming between him and the qiblah, let him do so.”
He ﷺ said, “When one of you prays toward something shielding him from the people and someone tries to pass in front of him, let him push him back at his chest—let him repel him as best he can (in another narration: let him stop him twice). If the person refuses, let him fight him, for he is only a devil.” He also said, “If the one who walks in front of a praying person knew how great a burden he bears, it would be better for him to stand still for forty than to pass in front of him.” ⦗114–129⦘
What Breaks the Prayer
He said, “A man’s prayer is broken if nothing the size of the back of a saddle is in front of him by a woman [who is menstruating], a donkey, or a black dog.” Abū Dharr asked, “Messenger of Allah, what is it about the black dog rather than the red one?” He replied, “The black dog is a devil.” ⦗130–139⦘