Genesis 24:1-4

Now Abraham was old, well advanced in age; and the LORD had blessed Abraham in all things. So Abraham said to the oldest servant of his house, who ruled over all that he had, “Please, put your hand under my thigh, and 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; but you shall go to my country and to my family, and take a wife for my son Isaac.”