Numbers 6:1-8

And Jehovah spake unto Moses, saying, Speak unto the children of Israel, and say unto them, When either man or woman shall make a special vow, the vow of a Nazirite, to separate himself unto Jehovah, he shall separate himself from wine and strong drink; he shall drink no vinegar of wine, or vinegar of strong drink, neither shall he drink any juice of grapes, nor eat fresh grapes or dried. All the days of his separation shall he eat nothing that is made of the grape-vine, from the kernels even to the husk. All the days of his vow of separation there shall no razor come upon his head: until the days be fulfilled, in which he separateth himself unto Jehovah, he shall be holy; he shall let the locks of the hair of his head grow long. All the days that he separateth himself unto Jehovah he shall not come near to a dead body. 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. All the days of his separation he is holy unto Jehovah.