Leviticus 21:4-6

Young's Literal Translation

⁴ `A master [priest] doth not defile himself among his people -- to pollute himself;

⁵ they do not make baldness on their head, and the corner of their beard they do not shave, and in their flesh they do not make a cutting;

⁶ they are holy to their God, and they pollute not the name of their God, for the fire-offerings of Jehovah, bread of their God, they are bringing near, and have been holy.