Musannaf Ibn Abi Shayba 19:278

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Muhammad bin Qais narrated to us, from Abu Husayn: That Uthman looked down upon the people on the Day of the House (ad-Dar) and said: "Do you not know that the blood of a Muslim man is not lawful except for four: a man who commits the act of the people of Lot..."