Judges 16:17-19

17And he told her all his heart, and said unto her, There hath not come a razor upon my head; for I have been a Nazirite unto God from my mother’s womb: if I be shaven, then my strength will go from me, and I shall become weak, and be like any other man.

18And when Delilah saw that he had told her all his heart, she sent and called for the lords of the Philistines, saying, Come up this once, for he hath told me all his heart. Then the lords of the Philistines came up unto her, and brought the money in their hand. 19And she made him sleep upon her knees; and she called for a man, and shaved off the seven locks of his head; and she began to afflict him, and his strength went from him.