Genesis 24:2 in the King James Version
And Abraham said unto his eldest servant of his house, that ruled over all that he had, Put, I pray thee, thy hand under my thigh:
Context
1 Abraham was old, and well advanced in age. The LORD had blessed Abraham in all things.
2 Abraham said to his servant, the elder of his house, who ruled over all that he had, “Please put your hand under my thigh.
3 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 for my son of the daughters of the Canaanites, among whom I live.