Judges 16:15 (KJV)

And Delilah said unto Samson, Hitherto thou hast mocked me, and told me lies: tell me wherewith thou mightest be bound. And he said unto her, If thou weavest the seven locks of my head with the web.

And she fastened it with the pin, and said unto him, The Philistines be upon thee, Samson. And he awaked out of his sleep, and went away with the pin of the beam, and with the web.

And she said unto him, How canst thou say, I love thee, when thine heart is not with me? thou hast mocked me these three times, and hast not told me wherein thy great strength lieth.

And it came to pass, when she pressed him daily with her words, and urged him, so that his soul was vexed unto death;

That he told her all his heart, and said unto her, There hath not come a razor upon mine head; for I have been a Nazarite 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.