'Oath' in the Bible

Then in the seventh year, Jehoiada sent messengers and brought in the commanders of hundreds, the Carites, and the guards. He had them come to him in the Lord’s temple, where he made a covenant with them and put them under oath. He showed 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.”