For it is written, Abraham had two sons, one out of the slave woman and one out of the free woman.
And Hagar bore a son to Abram, and Abram called the name of his son whom Hagar bore, Ishmael.
And she said to Abraham, Drive away this slave-girl and her son, for the son of this slave-girl shall not inherit with my son, with Isaac.
But, indeed, the one of the slave woman has been born according to flesh, and the one out of the free woman through the promise,
But what says the Scripture? “Cast out the slave woman and her son, for not shall the son of the slave woman inherit with the son of the free woman,” not ever! ` Gen. 21:10
Then, brothers, we are not children of a slave woman but of the free woman.