6 But unto the sons of the concubines, which Abraham had, Abraham gave gifts, and sent them away from Isaac his son, while he yet lived, eastward, unto the east country.
If then we are the sons of the free Jerusalem, let us realize that some gifts belong to those who are disinherited; others, to the heirs. For they are heirs to whom it is said, “You have not received a spirit of bondage so as to be again in fear, but you have received a spirit of adoption as sons, by virtue of which we cry: ‘Abba! Father!’ ”
[AD 430] Augustine of Hippo on Genesis 25:6