What does Judges 13:14 mean?
In response to Manoah's plea for more information about how to raise their prophesied son (Judges 13:2–12), God has stated that Manoah's wife must responsibly follow all prior instructions. These basics are now graciously repeated to Manoah."The angel of the LORD" leaves no room for doubt. Manoah's wife must not eat any part of any of grapes, fermented or otherwise. She must not drink any alcohol of any kind. She must not eat anything declared unclean by the law of Moses. The implication is that she must refuse all these things at least until the baby is born.
These rules are not a simple religious exercise for Manoah's wife. Instead, they correspond to the Nazarite vow (Numbers 6:1–21). The Lord's intent is that Samson remains untouched by any violation of this status from conception until death. This is not a normal part of the Nazirite vow. In fact, this child—later named Samson (Judges 13:24)—is the only one in Scripture explicitly labelled as a Nazirite from his very conception. The boundaries are given to keep restricted things away from the child, even through the body of his mother.