'Oath' in the Bible

Then they said, We will give them back, and take nothing for them; we will do as you say. Then I sent for the priests and made them take an oath that they would keep this agreement.

For in Judah there were a number of people who had made an agreement by oath with him, because he was the son-in-law of Shecaniah, the son of Arah; and his son Jehohanan had taken as his wife the daughter of Meshullam, the son of Berechiah.

They were united with their brothers, their rulers, and put themselves under a curse and an oath, to keep their steps in the way of God's law, which was given by Moses, the servant of God, and to keep and do all the orders of the Lord, our Lord, and his decisions and his rules;

And I took up the cause against them, cursing them and giving blows to some of them and pulling out their hair; and I made them take an oath by God, saying, You are not to give your daughters to their sons or take their daughters for your sons or for yourselves.