Judges 16:15-17

15Then Delilah said to him, ‘I realize that you do not really love me, because you will not tell me your secret. You have deceived me three times, as if I was a fool. You have refused to tell me what makes you so strong.’

16She continued to say the same thing to Samson many times. Her words made Samson very upset. He felt that he wanted to die.

17Finally, Samson told her his secret. He said to her, ‘No one has ever cut my hair. Even before I was born, I belonged to God as a Nazirite. If someone cuts off my hair, I would have no more strength. I would become as weak as any other man.’