Genesis 24:4

1 Now Abraham was old and far on in years: and the Lord had given him everything in full measure.

2 And Abraham said to his chief servant, the manager of all his property, Come now, put your hand under my leg:

3 And take an oath by the Lord, the God of heaven and the God of the earth, that you will not get a wife for my son Isaac from the daughters of the Canaanites among whom I am living;

4 But that you will go into my country and to my relations and get a wife there for my son Isaac.

5 And the servant said, If by chance the woman will not come with me into this land, am I to take your son back again to the land from which you came?

6 And Abraham said, Take care that you do not let my son go back to that land.

7 The Lord God of heaven, who took me from my father's house and from the land of my birth, and made an oath to me, saying, To your seed I will give this land: he will send his angel before you and give you a wife for my son in that land.