Numbers 6:2-4

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.