Samson told her all that was in his heart: "My hair has never been cut, because I have been a Nazirite to God from my mother's womb. If I am shaved, my strength will leave me, and I will become as weak as any other man."

Numbers 6:2
"Speak to the Israelites and tell them that if a man or woman makes a special vow, the vow of a Nazirite, to separate himself to the LORD,

Numbers 6:5
For the entire period of his vow of separation, no razor shall pass over his head. He must be holy until the time of his separation to the LORD is complete; he must let the hair of his head grow long.

Judges 13:5
For behold, you will conceive and give birth to a son. And no razor shall come over his head, because the boy will be a Nazirite to God from the womb, and he will begin the deliverance of Israel from the hand of the Philistines."

Judges 16:16
Finally, after she had pressed him daily with her words and pleaded until he was sick to death,

Judges 16:18
When Delilah realized that he had revealed to her all that was in his heart, she sent this message to the lords of the Philistines: "Come up once more, for he has revealed to me all that is in his heart." Then the lords of the Philistines came to her, bringing the money in their hands.

That he told her all his heart, and said to her, There has not come a razor on my head; for I have been a Nazarite to 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.