5 Bible Verses about Concubines

For it is written, Abraham had two sons, one by the bond-woman, another by the free-woman. And he of the bond-woman was born after the flesh, but he of the free-woman by promise.

But as then, he that was born after the flesh persecuted him that was born after the Spirit, so it is now also.

Neither because they are the seed of Abraham, are they all children, but in Isaac shall thy seed be called:

But what saith the scripture? Cast out the bond-woman and her son; for the son of the bond-woman shall not be heir with the son of the free-woman.

Of whom it had been said, In Isaac shall thy seed be called: