Genesis 24:1-4

Abraham was now a very old man, and the LORD had blessed him in every way. One day Abraham said to his oldest servant, the man in charge of his household, “Take an oath by putting your hand under my thigh. Swear by the LORD, the God of heaven and earth, that you will not allow my son to marry one of these local Canaanite women. Go instead to my homeland, to my relatives, and find a wife there for my son Isaac.”