Numbers 6:2-5

2“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,

3he 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.

4All the days of his separation he shall eat nothing that is produced by the grapevine, from seed to skin.

5‘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.