Genesis 24:2
So Abraham instructed the chief servant of his household, who managed all he owned, “Place your hand under my thigh,
Berean Standard Bible
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:
Abraham said to his servant, the elder of his house, who ruled over all that he had, “Please put your hand under my thigh.