What does Judges 13:16 mean?

But the Lord's messenger said, 'Even if you make me stay, I won't eat your food. But if you want to offer a burnt offering, offer it to the Lord.' Manoah still didn't realize this was the Lord's messenger. Judges 13:16 - Modern Text Bible

(The angel redirects Manoah's hospitality toward God, hinting at his true identity.)