Genesis 24:2-4

Abraham said to his servant, the oldest of his household, who had charge of all that he owned, “Please place your hand under my thigh, and I will make you swear by the LORD, the God of heaven and the God of earth, that you shall not take a wife for my son from the daughters of the Canaanites, among whom I live, but you will go to my country and to my relatives, and take a wife for my son Isaac.”