Musannaf Ibn Abi Shaybah 8111 — A man who stands to pray: where does

Sa'id al-Maqburi narrates from his father, who said: I said to Sayyiduna Abu Hurayrah (may Allah be pleased with him): "When I pray, where should I put my sandals?" He said: "Put them between your feet, and do not cause harm to any Muslim with them."