'Swear' in the Bible

Go, approach King David and say to him, ‘My lord the king, did you not swear to your servant: Your son Solomon is to become king after me, and he is the one who is to sit on my throne? So why has Adonijah become king?’

It was reported to Solomon: “Look, Adonijah fears King Solomon, and he has taken hold of the horns of the altar, saying, ‘Let King Solomon first swear to me that he will not kill his servant with the sword.’”

And now, as the Lord lives, the One who established me, seated me on the throne of my father David, and made me a dynasty as He promised—I swear Adonijah will be put to death today!”

So the king summoned Shimei and said to him, “Didn’t I make you swear by the Lord and warn you, saying, ‘On the day you leave and go anywhere else, know for sure that you will certainly die’? And you said to me, ‘The sentence is fair; I will obey.’

As the Lord your God lives, there is no nation or kingdom where my lord has not sent someone to search for you. When they said, ‘He is not here,’ he made that kingdom or nation swear they had not found you.

But the king said to him, “How many times must I make you swear not to tell me anything but the truth in the name of Yahweh?”