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 ofAllah, may Allah bless him and grant him peace, said, "Do not letanyone pass in front of you when you are praying. Repel him as much asyou can, and, if he refuses, fight him, for he is only a shaytan." (IT)
USC-MSA web (English) reference: Book 9, Hadith 36 (IT)
Arabic reference (IT): Book 9, Hadith 365 (IT)