Numbers 6:1-7

Then the LORD spoke to Moses, saying, “Speak to the children of Israel, and say to them: ‘When either a man or woman consecrates an offering to take the vow of a Nazirite, to separate himself to the LORD, he shall separate himself from wine and similar drink; he shall drink neither vinegar made from wine nor vinegar made from similar drink; neither shall he drink any grape juice, nor eat fresh grapes or raisins. All the days of his separation he shall eat nothing that is produced by the grapevine, from seed to skin. ‘All the days of the vow of his separation no razor shall come upon his head; until the days are fulfilled for which he separated himself to the LORD, he shall be holy. Then he shall let the locks of the hair of his head grow. All the days that he separates himself to the LORD he shall not go near a dead body. He shall not make himself unclean even for his father or his mother, for his brother or his sister, when they die, because his separation to God is on his head.