Judges 16:17-19

17So he divulged to her all his heart and said to her, “No razor has ever been upon my head, for I have been a Nazirite to God from my mother’s womb. If I am shaved, then my strength will go from me, and I will be weak and be like any other man.”

18Now when Delilah realized that he had confided to her all his heart, she sent and called for the Philistine lords saying, “Come up this time, for he has told me all his heart.” So the Philistine lords came up to her and brought the silver in their hand.

19Then she made him sleep upon her knees, and she called for a man and had the seven locks of his head shaved off. She even began to humiliate him while his strength departed from him.