'Confirm' in the Bible

but remember that the Lord your God gives you the power to gain wealth, in order to confirm His covenant He swore to your fathers, as it is today.

On the contrary, it is because of the wickedness of these nations that the LORD is dispossessing them before you to confirm what the LORD promised by an oath to your ancestors Abraham, Isaac, and Jacob.

‘Cursed is he who does not confirm the words of this law by doing them.’ And all the people shall say, ‘Amen.’