Leviticus 21:15-16

¹⁵meddle he not the generation of his kin to the common people of his folk, for I am the Lord, that halloweth him. (and so he shall not mix together, or dishonour, any of the generation of his kin among the common people, for I am the Lord, who maketh him holy.)

¹⁶And the Lord spake to Moses, and said,