Oral gospel traditions called the M source for Matthew and the L source for Luke, which may have been a mix of written and oral material (see Two-source hypothesis). Most scholars believe that the author of John's gospel used oral and written sources different from those available to the Synoptic authors – a "signs" source, a "revelatory discourse" source, and others – although there are indications that a later editor of this gospel may have used Mark and Luke. Oral transmission may also be seen as a different approach to understanding the Synoptic Gospels in New Testament scholarship. Current theories attempt to link
Gospel of the Nazarenes his "Commentary on Matthew", Jerome refers to the "Gospel of the Nazarenes" and the "Gospel of the Hebrews". Epiphanius is of the same opinion; he states in his "Panarion" that Matthew alone expounded and declared the gospel in Hebrew among the New Testament writers: "For in truth, Matthew alone of the New Testament writers expounded and declared the Gospel in Hebrew using Hebrew script." ("Panarion" 30.3.7) Origen adds to this by stating that, among the four gospels, Matthew, the one-time tax collector who later became an apostle of Jesus Christ, first composed the gospel for the converts from Judaism, published