Genesis 24:2-9

2So Abraham said to the oldest servant of his house, who ruled over all that he had, “Please, put your hand under my thigh,

3and I will make you swear by the Lord, the God of heaven and the God of the earth, that you will not take a wife for my son from the daughters of the Canaanites, among whom I dwell;

4but you shall go to my country and to my family, 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 take your son back to the land from which you came?”

6But Abraham said to him, “Beware that you do not take my son back there.

7The Lord God of heaven, who took me from my father’s house and from the land of my family, and who spoke to me and swore to me, saying, ‘To your descendants I give this land,’ He will send His angel before you, and you shall take a wife for my son from there.

8And if the woman is not willing to follow you, then you will be released from this oath; only do not take my son back there.”

9So the servant put his hand under the thigh of Abraham his master, and swore to him concerning this matter.