'Oath' in the Bible

Then they said, "We will restore them, and will require nothing of them; so will we do, even as you say." Then I called the priests, and took an oath of them, that they would do according to this promise.

they joined with their brothers, their nobles, and entered into a curse, and into an oath, to walk in God's law, which was given by Moses the servant of God, and to observe and do all the commandments of Yahweh our Lord, and his ordinances and his statutes;