Genesis 24:3-9

3 You must make a serious promise to me in front of the Lord. He is the God who rules both heaven and earth. I am living among the Canaanite people, but you must promise this to me: Do not get a Canaanite woman to be a wife for my son. 4 Instead, you must go to my own country. Go to my family there to find a wife for my son Isaac.’

24:2At that time, the people used this practice. It showed that a person was making a serious promise to another person.

5 The servant asked Abraham, ‘What should I do if the woman will not agree? Maybe she will not come back with me to this land? Must I then take your son to the country that you came from?’

6 Abraham replied, ‘No! You must never take my son back there. 7 The Lord, the God of heaven, took me away from there. He took me out of my father's house. He took me away from the land where my family lives. God made a serious promise to me. He said, “I will give this land to your descendants.” Because God has promised this, he will send his angel to go in front of you. When you arrive there, you will find a woman to marry my son. 8 But perhaps the woman will not agree to come back here with you. If that happens, you do not have to keep this promise. But do not take my son back to that land.’ 9 So the servant put his hand between Abraham's legs. The servant promised that he would do everything that Abraham had told him.