The book in the Bible that marks the beginning of the New Testament is the Gospel of Matthew.
Because Mark's gospel is the word of God which is truth and his gospel states: Mark 1.1. The beginning of the gospel of Jesus Christ, the Son of God;
When Jesus left the world and left Peter to lead the church. It says it somewhere in a gospel but I cant remember right now.
The calendar is intended to mark the number of years since the death of King Herod the Great. The Roman abbot Dionysus Exiguus devised the new Christian calendar in 533. He knew that it was impossible to say when Jesus was born, but he knew, or thought he knew, when Herod died. So, he chose to begin his Christian calendar on the year of Herod's death, and he based this on the reign of the Roman emperor Augustus. Unaware that Augustus only adopted that name four years after his reign began, going by his birth name of Octavius until then, Exiguus commenced his calendar just 4 years too late.
biblegateway.com
The Gospel according to John
in his head?
Read the book....
The word "Gospel" means a proclamation preached by Jesus Christ. The 4 gospel writers are the 4 Apostles of Christ who recorded these preachings for us in the Bible. They are gospels of Matthew, Mark, Luke, and John are placed at the beginning of the New Testament and make up about half its total text.
"In the beginning"
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New Testament people