Genesis 24:2-3

YLT(i) 2 and Abraham saith unto his servant, the eldest of his house, who is ruling over all that he hath, `Put, I pray thee, thy hand under my thigh, 3 and I cause thee to swear by Jehovah, God of the heavens, and God of the earth, that thou dost not take a wife for my son from the daughters of the Canaanite, in the midst of whom I am dwelling;