'Swear to Me' in the Bible

and now, swear to me by God here: thou dost not lie to me, or to my continuator, or to my successor; according to the kindness which I have done with thee thou dost with me, and with the land in which thou hast sojourned.'

and Jacob saith, 'Swear to me to-day:' and he sweareth to him, and selleth his birthright to Jacob;

and he saith, 'Swear to me;' and he sweareth to him, and Israel boweth himself on the head of the bed.