Genesis 24:38

35 The Lord has given my master every blessing, and he has become great: he has given him flocks and herds and silver and gold, and men-servants and women-servants and camels and asses.

36 And when Sarah, my master's wife, was old, she gave birth to a son, to whom he has given all he has.

37 And my master made me take an oath, saying, Do not get a wife for my son from the daughters of the Canaanites among whom I am living;

38 But go to my father's house and to my relations for a wife for my son.

39 And I said to my master, What if the woman will not come with me?

40 And he said, The Lord, whom I have ever kept before me, will send his angel with you, who will make it possible for you to get a wife for my son from my relations and my father's house;

41 And you will be free from your oath to me when you come to my people; and if they will not give her to you, you will be free from your oath.