Musannaf Ibn Abi Shaybah 27913 — What is disliked of a man peering

Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) said that a man peeped through a hole into the room of the Prophet (peace and blessings be upon him), while he had a comb with which he was scratching his head. He (peace and blessings be upon him) said: "Had I known that you were looking, I would have struck your eye with this comb. Permission is sought only because of the eyes."