Judges 16:17-19

17and he told her all his heart, and said to her, There has not come a razor upon my head; for I am a Nazarite of 1God from my mother's womb; if I should be shaven, then my strength would go from me, and I should be weak, and be like all mankind.

18And Delilah saw that he had told her all his heart, and she sent and called for the lords of the Philistines, saying, Come up this time, for he has told me all his heart. And the lords of the Philistines came up to her, and brought the money in their hand.

19And she made him sleep upon her knees, and called a man, and she caused him to shave off the seven locks of his head; and she began to overpower him, and his strength went from him.