Musnad Ahmad 30:2237

'Affan narrated to us, Hammad ibn Salamah narrated to us, from Suhayl ibn Abi Salih, that he said: I was walking with my father, and my father looked into the house of some people and saw a woman. He said: "If they had gouged out my eye, it would have been uncompensated (hadar)." Then he said: Abu Hurayrah narrated to me that he heard the Prophet, peace and blessings of Allah be upon him, say: "Whoever looks into the house of a people without their permission, and they gouge out his eye, it is uncompensated." And 'Affan said once: "my eye."