Judges - Chapter 16

Samson loves Delilah and she is trying to find the secret of Samson's strength.  He says to her:

“No razor has ever been used on my head,” he said, “because I have been a Nazirite dedicated to God from my mother’s womb."

There was a similar dedication of a child in the birth of John the Baptist.  An angel came to Zechariah (John's father) before John's birth, and said:

"Your wife Elizabeth will bear you a son, and you are to call him John. He will be a joy and delight to you, and many will rejoice because of his birth, for he will be great in the sight of the Lord. He is never to take wine or other fermented drink, and he will be filled with the Holy Spirit even before he is born. He will bring back many of the people of Israel to the Lord their God. And he will go on before the Lord, in the spirit and power of Elijah, to turn the hearts of the parents to their children and the disobedient to the wisdom of the righteous—to make ready a people prepared for the Lord.”