Nazarites: Prohibited From: Cutting or Shaving the Head
Source: TTT
Numbers 6:5
For the entire period of his vow of separation, no razor shall pass over his head. He must be holy until the time of his separation to the LORD is complete; he must let the hair of his head grow long.
Judges 13:5
For behold, you will conceive and give birth to a son. And no razor shall come over his head, because the boy will be a Nazirite to God from the womb, and he will begin the deliverance of Israel from the hand of the Philistines.”
Judges 16:17
Samson told her all that was in his heart: “My hair has never been cut, because I have been a Nazirite to God from my mother’s womb. If I am shaved, my strength will leave me, and I will become as weak as any other man.”