'Took an Oath' in the Bible

Then Joseph made the sons of Israel (Jacob) swear [an oath], saying, “God will surely visit you and take care of you [returning you to Canaan], and [when that happens] you shall carry my bones up from here.”

All the people came to urge David to eat food while it was still day; but David took an oath, saying, “May God do so to me, and more also, if I taste bread or anything else before the sun sets.”

Then the king swore an oath and said, “As the Lord lives, who has redeemed my soul from all distress,

As the Lord your God lives, there is no nation or kingdom where my master has not sent messengers to seek you; and when they said, ‘He is not here,’ Ahab made the kingdom or nation swear that they had not found you.

Now in the seventh year Jehoiada [the priest, Jehosheba’s husband] sent for the captains of hundreds of the Carites and of the guard and brought them to him to the house of the Lord. Then he made a covenant with them and put them under oath in the house of the Lord, and showed them the king’s [hidden] son.

They swore an oath to the Lord with a loud voice, with [jubilant] shouting, with trumpets, and with horns.

Then they said, “We will give it back and not require anything from them. We will do exactly as you say.” Then I called the priests and took an oath from them that they would act in accordance with this promise.