Genesis 24:1-4 KJV

1 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:

3 And I will make thee swear by the Lord, the God of heaven, and the God of the earth, that thou shalt not take a wife unto 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 unto my son Isaac.