Musnad Ahmad 119:1

Ubaydah ibn Humayd narrated to us, he said: Yazid ibn Abi Ziyad narrated to me, from Mujahid, from Abd al-Rahman ibn Safwan, who said: "I saw the Messenger of Allah, peace and blessings of Allah be upon him, between the Hijr and the door, placing his face upon the House."