Maliks Muwatta Book 9, Hadith Number 36.

Section : Warning against Passing in Front of Someone Praying.

Yahya related to me from Malik from Zayd ibn Aslam from Abd ar-Rahman ibn Abi Said al-Khudri from his father that the Messenger of Allah, may Allah bless him and grant him peace, said, “Do not let anyone pass in front of you when you are praying. Repel him as much as you can, and, if he refuses, fight him, for he is only a shaytan.”