Genesis 24:1-4

Abraham was now very old, and the LORD had blessed him in every way. He said to the senior servant in his household, the one in charge of all that he had, “Put your hand under my thigh. I want you to swear by the LORD, the God of heaven and the God of earth, that you will not get a wife for my son from the daughters of the Canaanites, among whom I am living, but will go to my country and my own relatives and get a wife for my son Isaac.”