But the Jerusalem above is free, which is our mother.
For it is written, "Rejoice, O barren woman, who does not give birth to [children]; burst out and shout, [you] who do not have birth pains, because many [are] the children of the desolate [woman], even more than [those of] the one who has a husband."28
But you, brothers, are children of the promise, just as Isaac.
But just as at that time the [child] born according to human descent persecuted the [child born] according to the Spirit, so also now.
But what does the scripture say? "Drive out the female slave and her son, for the son of the female slave will never inherit with the son"a of the free woman.
Therefore, brothers, we are not children of the female slave but of the free woman.