Judges 13:7

“ But he said to me, ‘Behold, you will conceive and bear a son, and now drink no wine nor strong drink, neither eat any unclean thing, for the child shall be a Nazirite to God from the womb to the day of his death.' ”

All she could do was repeat the message given to her, that she must herself refrain from wine and strong drink, and was to bear a child who was to be a lifelong Nazirite. That Samson failed in this stressed the greatness of his sin, for which he paid heavily. But God in His mercy ensured that his hair grew again and partially renewed his Naziriteship on the day of his death.