But what does the Scripture say? "Cast out the slave-woman and her son; for in no way shall the son of the slave-woman inherit with the son of the free woman."

Then, brothers, we are not children of a slave-woman, but of the free woman.

For it is written: Abraham had two sons, the one out of the slave-woman, and one out of the free woman.

But, indeed, he out of the slave-woman has been born according to flesh, and he out of the free woman through the promise;