Genesis 24:2–3
2 And Abraham said to his servant, nthe oldest of his household, who had charge of all that he had, o“Put your hand under my thigh, 3 that I may make you swear by the Lord, the God of heaven and God of the earth, that pyou will not take a wife for my son from the daughters of the Canaanites, among whom I dwell,
Genesis 24:9
9 So the servant vput his hand under the thigh of Abraham his master and swore to him concerning this matter.