Tertullian

“ Marcion, finding the Epistle of Paul to the Galatians (wherein he rebukes even apostles [7] ) for “not walking uprightly according to the truth of the gospel,” [8] as well as accuses certain false apostles of perverting the gospel of Christ) , labours very hard to destroy the character [9] of those Gospels which are published as genuine [10] and under the name of apostles, in order, forsooth, to secure for his own Gospel the credit which he takes away from them. ”

“ The former editions begin this third chapter with “Sed enim Marcion nactus.”↑ Aliud est si.↑ Sacramentum.↑ Habuit utique.↑ Paraturam.↑ Sed enim.↑ See Gal. ii. 13, 14.↑ Compare what has been already said in book i. chap. 20, and below in book v. chap. 3. See also Tertullian’s treatise, De Præscript. Hæret. chap. 23. ”