Development of the New Testament canon a novelty in Irenaeus's time. "Against Heresies" 3.11.7 acknowledges that many heterodox Christians use only one gospel while 3.11.9 acknowledges that some use more than four. The success of Tatian's Diatessaron in about the same time period is "...a powerful indication that the fourfold Gospel contemporaneously sponsored by Irenaeus was not broadly, let alone universally, recognized." Irenaeus apparently quotes from 21 of the New Testament books and names the author he thought wrote the text. He mentions the four gospels, Acts, the Pauline epistles with the exception of Hebrews and Philemon, as well as the first epistle of Peter, and
Jerusalem in Christianity Jerusalem in Christianity Jerusalem's role in first-century Christianity, during the ministry of Jesus and the Apostolic Age, as recorded in the New Testament, gives it great importance. According to the New Testament, Jerusalem was the city to which Jesus was brought as a child, to be presented at the Temple () and to attend festivals (). According to the canonical gospels, Jesus preached and healed in Jerusalem, especially in the Temple Courts. The events of Pentecost in the New Testament Book of Acts also took place at this location. There is also an account of Jesus' cleansing of the Temple