Numbers 6:5-9

6:5 All the days of the vow of his separation there shall no razor come upon his head: until the days be fulfilled, in the which he separateth [himself] unto the LORD, he shall be holy, [and] shall let the locks of the hair of his head grow. 6:6 All the days that he separateth [himself] unto the LORD he shall come at no dead body. 6:7 He shall not make himself unclean for his father, or for his mother, for his brother, or for his sister, when they die: because the consecration of his God [is] upon his head. 6:8 All the days of his separation he [is] holy unto the LORD. 6:9 And if any man die very suddenly by him, and he hath defiled the head of his consecration; then he shall shave his head in the day of his cleansing, on the seventh day shall he shave it.

Numbers 6:18

6:18 And the Nazarite shall shave the head of his separation [at] the door of the tabernacle of the congregation, and shall take the hair of the head of his separation, and put [it] in the fire which [is] under the sacrifice of the peace offerings.