Genesis 24:2-9

2And Abraham said to his servant, the eldest of his house, who ruled over all that he had, Put thy hand, I pray thee, under my thigh,

3and I will make thee swear by Jehovah, the 1God of the heavens and the 2God of the earth, that thou take not a wife for my son of the daughters of the Canaanites, among whom I am dwelling;

4but thou shalt go to my land and to my kindred, and take a wife for my son Isaac.

5And the servant said to him, Perhaps the woman will not be willing to follow me to this land: must I, then, bring thy son again in any case to the land from which thou hast removed?

6And Abraham said to him, Beware that thou bring not my son thither again.

7Jehovah the 3God of the heavens, who took me out of my father's house, and out of the land of my nativity, and who has spoken to me, and who has sworn to me, saying, Unto thy seed will I give this land — he will send his angel before thee, that thou mayest take a wife for my son thence.

8And if the woman be not willing to follow thee, then thou shalt be quit of this my oath: only, bring not my son thither again.

9And the servant put his hand under the thigh of Abraham his master, and swore unto him concerning that matter.