The Apostle Paul
Galatians 4:30BSB·traditional attribution

But what does the Scripture say? “Expel the slave woman and her son, for the slave woman’s son will never share in the inheritance with the free woman’s son.”

John Calvin Reformed @genevareformer

30. But what saith the Scripture? There was some consolation in knowing that we do but share the lot of our father Isaac; but it is a still greater consolation, when he adds, that hypocrites, with all their boasting, can gain nothing more than to be cast out of the spiritual family of Abraham; and that, to whatever extent they may harass us for a...

Matthew Henry Presbyterian @wholebiblehenry

In these verses the apostle illustrates the difference between believers who rested in Christ only and those judaizers who trusted in the law, by a comparison taken from the story of Isaac and Ishmael. This he introduces in such a manner as was proper to strike and impress their minds, and to convince them of their great weakness in departing from the truth, and suffering...

Commenting on Galatians 4:21-31

John Gill Reformed Baptist @doctorgill

So then, brethren,.... This is the conclusion of the whole allegory, or the mystical interpretation of Agar and Sarah, and their sons: we are not children of the bondwoman; the figure of the first covenant, which gendered to bondage, and typified the Jews in a state, and under a spirit of bondage to the law; New Testament saints are not under it, are delivered from...