Musnad Ahmad 333:24

Makki narrated to us, he said: Yazid ibn Abi Ubayd narrated to us, he said: I used to come to the mosque with Salamah, and he would pray by the pillar that is near the Mushaf. I said: "O Abu Muslim, I see you seeking to pray by this pillar." He said: "For I saw the Messenger of Allah, may Allah bless him and grant him peace, seeking to pray by it."