Judges 16:15-17

Then Delilah said to him, “How can you say, ‘I love you,’ when you don’t even trust me? This is the third time you have made a fool of me. You haven’t told me the secret of your great strength.” She kept bothering Samson about his secret day after day until he felt he was going to die! So he told her everything. He said, “I have never had my hair cut, because I have been set apart to God as a Nazirite since I was born. If someone shaved my head, I would lose my strength and be as weak as any other man.”