'Oath' in the Bible

And the seventh year Jehoiada sent and fetched the rulers over hundreds, with the captains and the guard, and brought them to him into the house of the LORD, and made a covenant with them, and took an oath of them in the house of the LORD, and shewed them the king's son.

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