Tell me, you who desire to be under the law, do you not listen to the law?
21. Tell me. Having given exhortations adapted to touch the feelings, he follows up his former doctrine by an illustration of great beauty. Viewed simply as an argument, it would not be very powerful; but, as a confirmation added to a most satisfactory chain of reasoning, it is not unworthy of attention.
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
For it is written,.... In Gen 16:15 that Abraham had two sons, not two sons only; for besides the two referred to, he had six more, Gen 25:2 but it being only pertinent to the apostle's purpose to take notice of these two, he mentions no more, though he does not deny that he had any more. These two sons were Ishmael and Isaac: the one by a bondmaid.