Judges 16:16-17

When she pressured him day after day with her words and pleaded with him, he was annoyed to death. Then [finally] he told her everything that was in his heart and said to her, “A razor has never been used on my head, for I have been a Nazirite to God from my mother’s womb. If I am shaved, then my strength will leave me, and I will become weak and be like any [other] man.”