'Freewoman' in the Bible

For it is written, that Abraham had two sons, one by the handmaid, and one by the freewoman.

Howbeit the'son by the handmaid is born after the flesh; but the'son by the freewoman is born through promise.

Howbeit what saith the scripture? Cast out the handmaid and her son: for the son of the handmaid shall not inherit with the son of the freewoman.

Wherefore, brethren, we are not children of a handmaid, but of the freewoman.