'Took an Oath' in the Bible

And I passed by thee and looked upon thee and lo! thy time was the time for endearments, So I spread my skirt over thee, and covered thy shame, And took an oath to thee And entered into covenant with thee. Declareth My Lord. Yahweh. And thou didst become mine.

He took of the king's seed, and made a covenant with him, and took an oath of him: The princes of the land toke he with him also,