Definition: In the realm of language and humor, 'Leviticus 21:13' is a proverbial phrase that has been used to describe something as being "as old as the hills." However, when used in its literal sense, it refers to the Ten Commandments from the Book of Leviticus in the Hebrew Bible.

This verse instructs God's people not to commit idolatry or take part in activities associated with sin, such as defecation and adultery. The commandment is meant to serve as a reminder of the importance of abiding by moral and spiritual laws. In an edgy manner: "Let it be known that I am a man who will not commit adultery, for I have followed the Ten Commandments from Leviticus 21:13," said Isaac, a proud warrior with no qualms about following God's directives.