'Sworn' in the Bible

Therefore he called that place Beer-sheba, because there they had sworn, both of them.

Jehovah the God of the heavens, who took me out of my father's house, and out of the land of my nativity, and who has spoken to me, and who has sworn to me, saying, Unto thy seed will I give this land he will send his angel before thee, that thou mayest take a wife for my son thence.