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
New Testament phraseology, and other evidence, modern scholarship generally concludes that Acts and the Gospel of Luke share the same author, referred to as Luke–Acts. Luke-Acts does not name its author. Church tradition identified him as Luke the Evangelist, the companion of Paul, but the majority of scholars reject this due to the many contradictions between Acts and the authentic Pauline letters. The most probable date of composition is around 80–100 AD, and there is evidence that it was still being substantially revised well into the 2nd century. The epistles of the New Testament are considered by Christians to be divinely inspired