'Oath' in the Bible

Come now, go to King David and say to him, Did you not, O my lord, take an oath to me, your servant, saying, Truly Solomon your son will be king after me, seated on the seat of my kingdom? why then is Adonijah acting as king?

She replied to him, "My master, you swore an oath to your servant by the Lord your God, 'Solomon your son will be king after me and he will sit on my throne.'

The king swore an oath and said, “As the Lord lives, who has redeemed my life from every difficulty,

I will keep today the oath I swore to you by the Lord God of Israel: 'Surely Solomon your son will be king after me; he will sit in my place on my throne.'"

And they gave Solomon word of it, saying, See, Adonijah goes in such fear of King Solomon, that he has put his hands on the horns of the altar, saying, Let King Solomon first give me his oath that he will not put his servant to death with the sword.

"Pay attention now! You have with you Gera's son Shimei the descendant of Benjamin from Bahurim. He cursed me violently that day when I had to leave for Mahanaim. When he visited me at the Jordan River, I made an oath to the LORD and told him, "I won't execute you with a sword.'

Then Solomon took an oath by the Lord: “May God punish me and do so severely if Adonijah has not made this request at the cost of his life.

the king summoned Shimei and said to him, "You will recall that I made you take an oath by the Lord, and I solemnly warned you, 'If you ever leave and go anywhere, know for sure that you will certainly die.' You said to me, 'The proposal is acceptable; I agree to it.'

Why then hast thou not kept the oath of the LORD, and the commandment that I have charged thee with?

Then he said, "Blessed be Yahweh the God of Israel who has promised with his mouth [to] David my father and fulfilled {by his oath}, saying,

If any man trespass against his neighbour, and an oath be laid upon him to cause him to swear, and the oath come before thine altar in this house:

Praise be to the Lord who has given rest to his people Israel, as he gave them his word to do; every word of all his oath, which he gave by the hand of Moses his servant, has come true.

As the LORD thy God liveth, there is no nation or kingdom, whither my lord hath not sent to seek thee: and when they said, He is not there; he took an oath of the kingdom and nation, that they found thee not.

Then the king said to him, Have I not, again and again, put you on your oath to say nothing to me but what is true in the name of the Lord?