Sahih Muslim Book 4, Hadith Number 1025.

Chapter : The excellence of the prayer and the way it is begun and the excellence of Ruku’ and moderation in it and prostration and moderation in it, etc.

‘Abdullah b. ‘Umar reported that the Messenger of Allah (may peace be upon him) said: When any one of you prays, he should not allow anyone to pass before him, and if he refuses, he should be then forcibly resisted, for there is a devil with him.