 It divides the history of first-century Christianity into three stages, with the gospel making up the first two of these – the arrival among men of Jesus the Messiah, from his birth to the beginning of his earthly mission in the meeting with John the Baptist followed by his earthly ministry, Passion, death, and resurrection (concluding the gospel story "per se").Most modern scholars agree that the main sources used by the author of Luke were the Gospel of Mark, a hypothetical sayings collection called the Q source, and material found in no other gospels, often referred to as the L (for Luke) source.Luke–Acts does not name its author.