Numbers 6:5-7

Young's Literal Translation

⁵ `All days of the vow of his separation a razor doth not pass over his head; till the fulness of the days which he doth separate to Jehovah he is holy; grown up hath the upper part of the hair of his head.

⁶ `All days of his keeping separate to Jehovah, near a dead person he doth not go;

⁷ for his father, or for his mother, for his brother, or for his sister -- he is not unclean for them at their death, for the separation of his God [is] on his head;