It is narrated from Sayyiduna al-Bara bin Azib (may Allah be pleased with him) that he said: I was searching for my lost camels and was wandering around the houses of the settlement when suddenly I came upon a band of riders. The people of the settlement began seeking refuge at my house. Then those riders surrounded my courtyard and brought a man out of it. They did not speak to him or ask him anything, but (immediately) struck off his head. When they left, I asked about him, and the people told me that he had married his father's wife (widow or divorcee). This hadith has an authentic chain (sahih al-isnad), but the two Shaykhs (Bukhari and Muslim) did not record it, and the hadith of Yazid bin al-Bara is a supporting witness (shahid) for it.