'Confirm' in the Bible

in order to confirm the oath which I swore to your forefathers, to give them a land flowing with milk and honey, as it is this day.”’” Then I said, “Amen, O Lord.”

and the prophet Jeremiah said, “Amen! May the Lord do so; may the Lord confirm your words which you have prophesied to bring back the vessels of the Lord’s house and all the exiles, from Babylon to this place.

For this is what the Lord says: “When 70 years for Babylon are complete, I will attend to you and will confirm My promise concerning you to restore you to this place.

This is what the Lord of Hosts, the God of Israel, says: ‘As for you and your wives, you women have spoken with your mouths, and you men fulfilled it by your deeds, saying, “We will keep our vows that we have made to burn incense to the queen of heaven and to pour out drink offerings for her.” Go ahead, confirm your vows! Pay your vows!’