Leviticus

Thou shalt not uncover the nakedness of thy father’s sister: she is thy father’s near kinswoman.

None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the Lord.

Therefore shall ye keep mine ordinance, that ye commit not any one of these abominable customs, which were committed before you, and that ye defile not yourselves therein: I am the Lord your God.

And Amram took him Jochebed his father’s sister to wife; and she bare him Aaron and Moses: and the years of the life of Amram were an hundred and thirty and seven years.

And they shall be upon Aaron, and upon his sons, when they come in unto the tabernacle of the congregation, or when they come near unto the altar to minister in the holy place; that they bear not iniquity, and die: it shall be a statute for ever unto him and his seed after him.