The Torah in Parashat Ahareh-Mot (Vayikra 18:14) commands that one may not engage in intimate relations with “Ahi Avicha” – one’s father’s brother. Of course, such a relationship is already forbidden due to the prohibition of Mishkab Zachur (male homosexual intercourse). The Torah here adds a second prohibition, such that one who transgresses and commits such as act is in violation of two Biblical commands. This prohibition applies regardless of whether the man and one’s father share both parents, only a father, or only a mother, and regardless of whether the uncle was the product of marriage or of an illicit relationship. This command applies at all times and in all places. If a man and an uncle intentionally violate this prohibition, they are both liable to Sekila (execution by stoning). If this transgression is committed unintentionally, the violator must offer two Hataot (sin-offerings) – one to atone for the sin of Mishkab Zachur, and a second to atone for the particular sin of relations with an uncle.