Judges 16:17-19

17that he told her all his heart, and said to her, “No razor has ever come upon my head, for I have been a Nazirite to God from my mother’s womb. If I am shaven, 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 for the lords of the Philistines, saying, “Come up once more, for he has told me all his heart.” So the lords of the Philistines came up to her and brought the money in their hand.

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