'Swear to Me' in the Bible

Now, therefore, swear to me by God, here, that thou wilt not deal falsely by me, nor by mine offspring, nor by my descendants, - according to the lovingkindness wherewith I have dealt with thee, shalt thou deal with me, and with the land wherein thou hast sojourned.

And Jacob said, Come swear to me just now! And he sware to him, - and sold his birthright to Jacob.

Then he said: Come, swear to me! And he sware to him. Then did Israel how himself down on the head of the couch.