Genesis 24:2-12

2 And Abraham said unto his eldest slave of his house, who ruled over all that he had, Put, I pray thee, thy hand under my thigh,
3 and I will make thee swear by the LORD, the God of the heavens and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell;
4 but thou shalt go unto my country and to my kindred and take a wife unto my son Isaac.
5 And the slave said unto him, Peradventure the woman will not be willing to follow me unto this land, must I therefore bring thy son again unto the land from which thou didst come?
6 And Abraham said unto him, Beware that thou not bring my son there again.
7 The LORD God of heaven, who took me from my father’s house and from the land of my kindred and who spoke unto me and swore unto me, saying, Unto thy seed will I give this land; he shall send his angel before thee, and thou shalt take a wife unto my son from there.
8 And if the woman will not be willing to follow thee, then thou shalt be free from this my oath; only do not bring my son there again.
9 Then the slave put his hand under the thigh of Abraham his master and swore to him concerning that matter.
10 And the slave took ten camels of the camels of his master and departed with the best of what his master had in his hand; and he arose and went to Ara-naharaim, unto the city of Nahor.
11 And he made his camels kneel down outside the city by a well of water at the time of the evening, even the time that women go out to draw water.
12 And he said, O LORD, God of my master Abraham, I pray thee, to have a good encounter this day and show mercy unto my master Abraham.