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."
Muwatta Malik Book 9, Hadith 38
← Previous Hadith Yahya related to me from Malik from Ibn Shihab that Ubaydullah ibn Abdullah ibn Utba said, "I visited Umar ibn al-Khattab just before noon and found him praying a voluntary prayer. So I stood behind him, but he pulled me nearer and put me next to him, on his right hand side, and then Yarfa came and I moved back and we formed a row behind him."

Muwatta Malik Book 9, Hadith 37 Next Hadith → Yahya related to me from Malik from Abu'n Nadr, the mawla of Umar ibn Ubaydullah from Busr ibn Said that Zayd ibn Khalid al-Juhani sent him to Abu Juhaym to ask him what he had heard from the Messenger of Allah, may Allah bless him and grant him peace, about passing in front of someone praying. Abu Juhaym said, "The Messenger of Allah, may Allah bless him and grant him peace, said, 'If the one who passes in front of a man praying knew what he was bringing upon himself it would be better for him to stop for forty than to pass in front of him.' "

Abu'n-Nadr said, "I do not know whether he said forty days or months or years."

Muwatta Malik Book 9, Hadith 39