Musnad Abu Ya'la al-Mawsili 4:1

Abu Ya'la Ahmad ibn Ali ibn al-Muthanna al-Mawsili informed us, Ubayd Allah ibn Umar al-Qawariri narrated to us, Abd al-Rahman ibn Mahdi narrated to us, from Za'idah ibn Qudamah, from Simak ibn Harb, from Musa ibn Talhah, from his father, from the Prophet, peace and blessings of Allah be upon him: "Let one of you place in front of him something like the back part of a saddle, then let him pray."