Genesis 24:4 ASV

²  And Abraham said unto his servant, the elder of his house, that ruled over all that he had, Put, I pray thee, thy hand under my thigh.

³  And I will make thee swear by Jehovah, the God of heaven and the God of the earth, that thou wilt not take a wife for my son of the daughters of the Canaanites, among whom I dwell.

⁴  But thou shalt go unto my country, and to my kindred, and take a wife for my son Isaac.

⁵  And the servant said unto him, Peradventure the woman will not be willing to follow me unto this land. Must I needs bring thy son again unto the land from whence thou camest?

⁶  And Abraham said unto him, Beware thou that thou bring not my son thither again.