I asked Anas ibn Mālik: Did the Prophet (may Allah's peace and blessings be upon him) use to pray with his shoes on? He said: Yes! If anyone of you is praying behind something that conceals him from people and somebody tries to pass in front of him, he should push him away; if he refuses, the praying person should use force against him for he is a devil Take this curtain of yours away, for its images come to my mind while I'm praying Yawning inside the prayer is from the devil, so if anyone of you yawns, let him suppress it as much as he can When the heat is intense, delay the prayer until it becomes fairly cool, for intense heat is from the boiling and breathing of Hellfire I watched the prayer of Muhammad (may Allah's peace and blessings be upon him) and found his standing, his bowing, standing after bowing, prostration, sitting between the two prostrations, prostration, and sitting between Taslīm (end of the prayer) and going away nearly equal to one another If the person passing in front of someone praying knew the extent of the guilt he is incurring, he would prefer to stand for forty rather than pass in front him. Abu An-Nadr said: I am not sure if he said forty days, months, or years We used to pray and animals would pass in front of us. We mentioned that to the Messenger of Allah (may Allah's peace and blessings be upon him) so he said: If anything, like the back of the saddle, is placed in front of anyone of you, then nothing that passes in front of him (but behind that thing) can harm him When anyone of you prays, let him do so behind a barrier, even if an arrow When one of you stands up to pray, he should put a screen in front of him as tall as the height of the back of a saddle. If he does not have something the height of the back of a saddle in front of him, his prayer would be invalidated if a donkey, a woman, or a black dog passed in front of him Take this garment of mine to Abu Jahm and bring me his plain garment, because this one has distracted me from my prayer O people, there is nothing remaining of the glad tidings of prophet-hood except a good vision that a Muslim sees or someone else sees it for him. Verily, I have been forbidden to recite the Qur'an while bowing or prostrating If the one passing in front of a person who is praying would know the gravity of his sin, it would have been better for him to stand for forty than to pass in front him When anyone of you prays towards an object that acts as a barrier between him and the people and then someone tries to pass in front of him, he should push him away; and if he insists, he should fight him, for indeed he is a devil