Bible Verses About Nazarites: Cutting or shaving the head

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.

for, lo, thou shalt conceive, and bear a son; and no razor shall come upon his head; for the child shall be a Nazirite unto God from the womb: and he shall begin to save Israel out of the hand of the Philistines.

And he told her all his heart, and said unto her, There hath not come a razor upon my head; for I have been a Nazirite unto 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.