Judges 16:18-20

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.

20And she said, "The Philistines are upon you, Samson!" And he awoke from his sleep and said, "I will go out as at other times and shake myself free." But he did not know that the Lord had left him.