The Gospels are the teachings and history of Jesus Christ as recorded and revealed in the first four books of the New Testament: Matthew, Mark, Luke and John. The word ‘gospel’ comes from the Anglo-Saxon (Old English) ‘god-spell’ or good tidings or glad tidings. In the Greek it is ‘evangelion’ from which comes ‘evangelize.’
‘Gospel’ according to Strong’s Greek Lexicon (G 2097, 2098, 2099) is εὐαγγελίζω or euaggelizó: to announce (or proclaim) good news; εὐαγγέλιον or euaggelion: good news; and εὐαγγελιστής or euaggelistes: evangelist(s) or bearer of good tidings.
The ‘Gospel of Mark’ chapter one states, “…Jesus came into Galilee, preaching the gospel of the kingdom of God; and saying, ‘the time is fulfilled, and the kingdom of God is at hand: Repent and believe the gospel (M 1:14-15).” In the original Greek – preaching is Kerygma, which according to Strong’s Concordance (#2782 – proclamation; from 2784, ‘to proclaim’ or ‘to preach.’ (on REPENTANCE)
The preaching was not a sermon but a proclamation of the truth and ‘the Gospel.’ The prophet Isaiah said, ‘the Spirit of the Sovereign LORD is on me, because the Lord has anointed me to proclaim good news to the poor (needy) (Isa. 61:1).” Upon receiving the Holy Spirit – our Helper, who ‘will teach us (John 14:26),’ the Christian is both compelled and commanded to proclaim the ‘good news;’ especially to the needy – those in need of our Savior Jesus. The Gospel is the goods news that Jesus, the Son of God came to earth, died on the Cross for the remission (forgiveness) of our sins; and on the third day rose from the dead, and after speaking with the apostles and others, before Pentecost, He ascended into Heaven where He is ‘at the right hand of God the Father.’ The Good News is summarized in the Nicene Creed.
In the Gospel of Matthew – in one of its most important verses, Jesus said, “Whoever confesses (proclaims) Me before others (before men or in public), I will also confess them before My Father who is in heaven. But whoever denies Me before men, I will also deny them before My Father who is in heaven (Matt. 10:32-33).” See that obedience and faith towards our Lord Jesus Christ involves ‘proclaiming’ our Lord to others.
Though some are called to be ‘evangelists, pastors and teachers (Eph. 4:11);’ all Christians “are the called of Jesus Christ… to be saints (holy)… (to be) not ashamed of the gospel of Christ… for the just shall live by faith (Rom. 1:6-16).”
Thus, in the last chapter and last verses of the Gospel according to Matthew, before Jesus ascends to Heaven, He commands His disciples (followers, students) “Go to all peoples everywhere; go and make disciples of all the nations, baptizing them… and teaching them to observe all things that I have commanded you… (Matt. 10:19-20);.” going to ‘proclaim’ the ‘gospel of Jesus’ is both implied and explicit to all Christians.
The Gospels our written by four men (moved by the Holy Spirit – 2 Peter 1:21), so they vary slightly in the delivery and important. One has more parables; another a little more history; but all the gospels are in harmonization with one another. Moreover, unlike any other ancient book; the Bible and it gospels are verified and used by numerous witnesses within decades and a couple of centuries from their original writing.