'Swear' in the Bible

Go and get thee in to king David, and say to him, Didst not thou, my lord, O king, swear to thy handmaid saying, Solomon thy son shall reign after me, and he shall sit on my throne? why then does Adonijah reign?

And it was told Solomon saying, Behold, Adonijah fears king Solomon; for behold, he has caught hold of the horns of the altar, saying, Let king Solomon swear to me this day that he will not put his servant to death with the sword.

And the king sent and called for Shimei, and said to him, Did I not make thee swear by Jehovah, and protest to thee, saying, Know for certain, that on the day thou goest forth, and walkest abroad anywhere, thou shalt surely die? and thou saidst to me, The word that I have heard is good.