Numbers 6:7-9

American Standard Version

⁷ He shall not make himself unclean for his father, or for his mother, for his brother, or for his sister, when they die; because his separation unto God is upon his head. ⁸ All the days of his separation he is holy unto Jehovah.

⁹ And if any man die very suddenly beside him, and he defile the head of his separation; then he shall shave his head in the day of his cleansing, on the seventh day shall he shave it.