Judges 16:17-19

17And he told her all his heart, and said to her, "A razor has never come upon my head, for I have been a Nazirite to God from my mother's womb. If my head is shaved, then my strength will leave me, and I shall become weak and be like any other man."

18When Delilah saw that he had told her all his heart, she sent and called the lords of the Philistines, saying, "Come up again, for he has told me all his heart." Then the lords of the Philistines came up to her and brought the money in their hands.

19She made him sleep on her knees. And she called a man and had him shave off the seven locks of his head. Then she began to torment him, and his strength left him.