Sayyiduna Bara' (may Allah be pleased with him) narrates from his maternal uncle that a man married his father's wife, or his son's wife (so Abu Khalid said), so the Prophet (peace and blessings be upon him) sent for him and he was killed.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحدود / 17055