Genesis 24:2-5 And Abraham said to his oldest servant of his house, that ruled over all that he had, Put, I pray you, your hand under my thigh:

AKJV⁽ⁱ⁾ ² And Abraham said to his oldest servant of his house, that ruled over all that he had, Put, I pray you, your hand under my thigh: ³ And I will make you swear by the LORD, the God of heaven, and the God of the earth, that you shall not take a wife to my son of the daughters of the Canaanites, among whom I dwell: ⁴ But you shall go to my country, and to my kindred, and take a wife to my son Isaac. ⁵ And the servant said to him, Peradventure the woman will not be willing to follow me to this land: must I needs bring your son again to the land from from where you came?