Ep. ad Smyr. chap. 3. Jerome, quoting this passage from Ignatius in his de vir. ill. 16, refers it to the gospel which had lately been translated by him (according to de vir. ill. 3), viz.: the Gospel of the Nazarenes (or the Gospel according to the Hebrews). In his Comment. in Isaiam, Bk. XVIII. introd., Jerome quotes the same passage again, referring it to the same gospel (Evangelium quod Hebræorum lectitant Nazaræi). But in Origen de prin. præf. 8, the phrase is quoted as taken from the Teaching of Peter (“qui Petri doctrina apellatur”). Eusebius’ various references to the Gospel according to the Hebrews show that he was personally acquainted with it (see above, chap. 25, note 24), and knowing his great thoroughness in going through the books which he had access to, it is impossible to suppose that if this passage quoted from Ignatius were in the Gospel according to the Hebrews he should not have known it. We seem then to be driven to the conclusion that the passage did not originally stand in the Gospel according to the Hebrews, but was later incorporated either from the Teaching of Peter, in which Origen found it, or from some common source or oral tradition.