Musannaf Ibn Abi Shayba 3:500

Ibn ‘Ulayyah narrated to us, from Isma’il ibn Umayyah, from Muslim Abu Maryam, from Ibn ‘Umar, who said: "When one of you prays, let him pray towards a sutrah (barrier), and let him draw near to it, so that the devil may not pass in front of him."