'Oath' in the Bible

in order to establish the oath I swore to your ancestors, to give them a land flowing with milk and honey, as it is today.”I answered, “Amen, Lord.”

Gedaliah son of Ahikam, son of Shaphan, swore an oath to them and their men, assuring them, “Don’t be afraid to serve the Chaldeans. Live in the land and serve the king of Babylon, and it will go well for you.