Musannaf Ibn Abi Shaybah 30550 — Those who permitted shaving

Khilas said: "A man was brought who had four men with him. Three of them testified to zina (unlawful sexual intercourse), and the fourth did not come forward with his testimony. So Sayyiduna Ali (may Allah be pleased with him) flogged the three, and he cut the hair of the one who had been testified against."