5 Bible Verses about Concubines

where it is written, that Abraham had two sons, one by a servant, and one by a free-woman? But he who was of the servant, was born according to the course of nature; whereas the son of the free-woman was by virtue of the promise.

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

Nor because they are the seed of Abraham, are they all children of promise: but "in Isaac shall thy seed be called."

But what saith the scripture? "Cast out the servant and her son: for the son of the servant shall not inherit with the son of the free-woman."

of whom it was told him, that in Isaac shall thy seed be called: