Leviticus 21:4

King James Version - American Edition

But he shall not defile himself, being a chief man among his people, to profane himself.

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and for his sister a virgin, that is nigh unto him, which hath had no husband; for her may he be defiled.

They shall not make baldness upon their head, neither shall they shave off the corner of their beard, nor make any cuttings in their flesh.