It is narrated from Hazrat Sahl (may Allah be pleased with him) that Hazrat Uwaymir (may Allah be pleased with him) once came to Asim bin Adi (may Allah be pleased with him) and said, "Ask the Noble Prophet (peace and blessings be upon him) about this issue: if a man finds another man with his wife and kills him, will he also be killed in retaliation, or what will be done with him?" Asim (may Allah be pleased with him) asked the Noble Prophet (peace and blessings be upon him) about this issue, but the Noble Prophet (peace and blessings be upon him) did not like this question. Later, Uwaymir (may Allah be pleased with him) met Asim (may Allah be pleased with him) and asked, "What happened?" Asim (may Allah be pleased with him) replied, "What could have happened? You did not tell me a good thing. I asked the Noble Prophet (peace and blessings be upon him), but he did not like this question." Uwaymir (may Allah be pleased with him) said, "By Allah! I will go myself to the Noble Prophet (peace and blessings be upon him) and will ask him this question." So he presented himself in the court of Prophethood, and by that time, revelation had already come to the Noble Prophet (peace and blessings be upon him) regarding this matter. Therefore, the Noble Prophet (peace and blessings be upon him) called both husband and wife and had them perform li'an (mutual cursing). Then Uwaymir (may Allah be pleased with him) said, "O Messenger of Allah! If I take her back with me, it would mean that I have wronged her." So, even before the Noble Prophet (peace and blessings be upon him) commanded, he separated from his wife (divorced her), and this practice became established among those who perform li'an.