Leviticus 21:4-6

Revised Standard Version Catholic Edition

⁴ He shall not defile himself as a husband among his people and so profane himself. ⁵ They shall not make tonsures upon their heads, nor shave off the edges of their beards, nor make any cuttings in their flesh. ⁶ They shall be holy to their God, and not profane the name of their God; for they offer the offerings by fire to the Lord, the bread of their God; therefore they shall be holy.