‘And my master made me swear saying, “You will not take a wife for my son from the daughters of the Canaanites in whose land I dwell, but you will go to my father's house, and to my kindred, and take a wife for my son”.'
The steward now makes clear he is acting under oath, and the content of the oath. His words would bring approving nods from the hearers. They too recognise the importance of marriage within the family. Notice that Abraham speaks of ‘my father's house'. It is of course now the house of Nahor but Abraham is stressing through his steward that they and he are one household. They are all of the family of Terah. While he may have separated from them, the ties of blood hold firm. Thus he wishes his son to marry within the family.