Genesis 24:1-2 King James Version (KJV)
24 And Abraham was old, and well stricken in age: and the Lord had blessed Abraham in all things.
2 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:
Genesis 24:1-2 New International Version (NIV)
Isaac and Rebekah
24 Abraham was now very old, and the Lord had blessed him in every way. 2 He said to the senior servant in his household, the one in charge of all that he had, “Put your hand under my thigh.