It is narrated from Hazrat Bara’ (may Allah be pleased with him) that some horsemen appeared and they besieged the house in which I was. They took a man out from it and without any delay, beheaded him. When they left, I inquired about him, and people told me that he had married his father’s wife. The Prophet Muhammad (peace and blessings be upon him) had sent those people to kill him.
Hadith Referenceمسند احمد / أول مسند الكوفيين / 18609