Thematic Bible: Sends hagar and ishmael away

And she said to Abraham, Cast out this handmaid and her son; for the son of this handmaid shall not inherit with my son with Isaac. And the thing was very grievous in Abraham's sight because of his son. And God said to Abraham, Let it not be grievous in thy sight because of the lad and because of thy handmaid: in all that Sarah hath said to thee hearken to her voice, for in Isaac shall a seed be called to thee. read more.
But also the son of the handmaid will I make a nation, because he is thy seed. And Abraham rose up early in the morning, and took bread, and a flask of water, and gave it to Hagar, putting it on her shoulder and the child, and sent her away. And she departed, and wandered about in the wilderness of Beer-sheba.

For it is written that Abraham had two sons; one of the maid servant, and one of the free woman. But he that was of the maid servant was born according to flesh, and he that was of the free woman through the promise. Which things have an allegorical sense; for these are two covenants: one from mount Sinai, gendering to bondage, which is Hagar. read more.
For Hagar is mount Sinai in Arabia, and corresponds to Jerusalem which is now, for she is in bondage with her children; but the Jerusalem above is free, which is our mother. For it is written, Rejoice, thou barren that bearest not; break out and cry, thou that travailest not; because the children of the desolate are more numerous than those of her that has a husband. But ye, brethren, after the pattern of Isaac, are children of promise. But as then he that was born according to flesh persecuted him that was born according to Spirit, so also it is now. But what says the scripture? Cast out the maid servant and her son; for the son of the maid servant shall not inherit with the son of the free woman.