Musannaf Ibn Abi Shaybah 3438 — Those who disliked a man leaning

The mawlah of Abu Hazim said: I was among the People of the Suffah. We had ropes which we would hold on to when we grew tired or drowsy in prayer, and we also had mats on which we would stand to protect ourselves from the hardness of the ground. Once Sayyiduna Abu Bakr (may Allah be pleased with him) came and said: "Cut these ropes, and pray on the ground."