Musannaf Ibn Abi Shayba 3:537

Abu Khalid al-Ahmar narrated to us, from Muhammad ibn Ajlan, from Zayd ibn Aslam, from Abd al-Rahman ibn Abi Sa'id al-Khudri, from Abu Sa'id al-Khudri, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "If someone comes to pass in front of him [while he is praying], let him fight him, for he is only a devil."