Musnad Ahmad 30:804

Yazid narrated to us, Hammad ibn Salamah informed us, from Thabit al-Bunani, from Abdullah ibn Rabah, from Abu Hurairah, that the Prophet, peace and blessings of Allah be upon him, said on the day of the conquest of Makkah: "Whoever closes his door, he is safe. And whoever enters the house of Abu Sufyan, he is safe."