Hippolytus of Rome — on Gal 2:4 (Hippolytus Exegetical Fragments)

“"And they watched diligently." And this, too, is to be noted. For up to the present time both the Gentiles and the Jews of the circumcision watch and busy themselves with the dealings of the Church, desiring to suborn false witnesses against us, as the apostle says: "And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus."”