for, behold, you shall conceive, and bear a son; and no razor shall come on his head; for the child shall be a Nazirite to God from the womb: and he shall begin to save Israel out of the hand of the Philistines.
The appearance of the Angel of the Lord always marked a very significant event in Israel’s history. The only other birth He announced was Isaac’s (Genesis 18:1; Genesis 18:10). Samson would have an unusual opportunity to serve God.