5 Bible Verses about Concubines

For it is written that Abraham had two sons, the one by a bondwoman, and the other by a free. Now the son of the bond-maid was born after the flesh, but that by the free woman was by promise.

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

nor, 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-maid shall in no wise inherit with the son of the free woman."

unto whom it had been said, "That by Isaac shall there be a seed bearing thy name:"