Numbers 6:5
All the days of the vow of his separation there shall no razor come on his head: until the days be fulfilled, in the which he separates himself to the LORD, he shall be holy, and shall let the locks of the hair of his head grow.
Torrey's Topical Textbook—AKJV

Judges 16:17,19,20
That he told her all his heart, and said to her, There has not come a razor on my head; for I have been a Nazarite to God from my mother's womb: if I be shaven, then my strength will go from me, and I shall become weak, and be like any other man.
Torrey's Topical Textbook—AKJV