Genesis 24:5-9

5And the servant said unto him, Peradventure the woman will not be willing to follow me unto this land: must I needs bring thy son again unto the land from whence thou camest? 6And Abraham said unto him, Beware thou that thou bring not my son thither again. 7Jehovah, the God of heaven, who took me from my father’s house, and from the land of my nativity, and who spake unto me, and who sware unto me, saying, Unto thy seed will I give this land; he will send his angel before thee, and thou shalt take a wife for my son from thence. 8And if the woman be not willing to follow thee, then thou shalt be clear from this my oath; only thou shalt not bring my son thither again. 9And the servant put his hand under the thigh of Abraham his master, and sware to him concerning this matter.