Bible Verses About Oaths: Pledging allegiance to sovereigns

And in the seventh year Jehoiada sent and fetched the captains over hundreds of the Carites and of the guard, and brought them to him into the house of Jehovah; and he made a covenant with them, and took an oath of them in the house of Jehovah, and showed them the king’s son.

I counsel thee, Keep the king’s command, and that in regard of the oath of God.