Numbers 6:18

Overview - Numbers 6
The law of the Nazarite in the days of his separation;
13 and after their completion.
22 The form of blessing the people.
Treasury of Scripture Knowledge

Numbers 6:18  (King James Version)
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.

shave the head
The hair, which was permitted to grow for this purpose, was shaven off, as a token that the vow was accomplished.
Numbers 6:5 Numbers 6:9 ; Acts 18:18 ; Acts 21:24 Acts 21:26

and put it
Luke 17:10 ; Ephesians 1:6