Genesis 24:7-9

Young's Literal Translation

⁷ Jehovah, God of the heavens, who hath taken me from the house of my father, and from the land of my birth, and who hath spoken to me, and who hath sworn to me, saying, To thy seed I give this land, He doth send His messenger before thee, and thou hast taken a wife for my son from thence;

⁸ and if the woman be not willing to come after thee, then thou hast been acquitted from this mine oath: only my son thou dost not cause to turn back thither.'

⁹ And the servant putteth his hand under the thigh of Abraham his lord, and sweareth to him concerning this matter.