Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Ata that Suhail bin Amr was a man whose lower lip was split. When he was brought as a prisoner on the day of Badr, Hazrat Umar bin Khattab submitted, "O Messenger of Allah (peace and blessings be upon him)! Remove his two lower front teeth so that his tongue will protrude and he will not be able to speak against you anywhere." The Prophet (peace and blessings be upon him) said, "I do not mutilate, lest Allah mutilate me in return."