Irenaeus Against Heresies

It follows then, as of course, that these men must either receive the rest of his narrative, or else reject these parts also. For no persons of common sense can permit them to receive some things recounted by Luke as being true, and to set others aside, as if he had not known the truth. And if indeed Marcion's followers reject these, they will then possess no Gospel; for, curtailing that according to Luke, as I have said already, they boast in having the Gospel [in what remains].