'Razor Shall Come Upon His Head' in the Bible

All the days of his vow to separate, no razor shall come upon his head. Until all the days are fulfilled in which he separates to Jehovah, he shall be holy. He shall let the locks of the hair of his head grow.

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.