Galatians 4:27

Verse 27. For it is written. This passage is found in Isa 44:1. For an exposition of its meaning as it occurs there, see my Notes on Isaiah. The object of the apostle in introducing it here seems to be to prove that the Gentiles, as well as the Jews, would partake of the privileges connected with the heavenly Jerusalem. He had in the previous verse spoken of the Jerusalem from above as the common mother of ALL true Christians, whether by birth Jews or Gentiles. This might be disputed or doubted by the Jews; and he therefore adduces this proof from the Old Testament. Or if it was not doubted, still the quotation was pertinent, and would illustrate the sentiment which he had just uttered.