What explains the Prophet's rejection of Umar's suggestion to break Suhayl ibn Amr's front teeth, saying, "Had I done that, Allah would disfigure me on the Day of Resurrection, and I am His messenger," while Islamic Sharia mandates cutting off the hand of a thief?

The narration stating that Umar ibn Al-Khattab (may Allah be pleased with him) asked the Messenger of Allah (peace be blessings of Allah be upon him) to remove Suhayl ibn Amr's front teeth so that he would not deliver speeches again, and that the Messenger refused, saying: "I will not mutilate him, lest Allah mutilate me, even if I am a Prophet," and "Perhaps he will take a stand that you will not disapprove of," is a narration with a weak or mursal chain of transmission, and it is not authentic.

This narration has no relation to the حد (prescribed punishment) for theft, which Allah legislated for great wisdom. The حد for theft is a divine, decreed legislation, and there is no room for analogy with other actions such as cutting out the tongue of an abuser or the like. One must submit to Allah's command and legislation concerning it.