The Epistle of Paul the Apostle to the Galatians, written in A.D. 57 or 58, probably from Antioch, is the cornerstone of Christian freedom. In Galatians Paul tells of his own conversion and of how he stood firm in his belief that Christ was the Savior of people everywhere, not just those who observed every detail of the Jewish law.

Galatians 4

4:30 Nevertheless what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman.