Many scholars argue that Mark was the first gospel written. Mark's work was then published as a gospel after Peter was martyred in AD 66 or AD 67. It is the shortest of the three Synoptic Gospels, so scholars believe Matthew and Luke expound upon Mark's gospel. The existence of eyewitnesses lends credibility to the gospel accounts and helps determine a general order of writing. More important than knowing which gospel was written first, we should challenge ourselves to understand the truth contained in the Gospels and thank God for giving us the privilege of having His holy words by which we can know the love Jesus Christ has for us (1 John 4:10–17).
No matter to which view a reader subscribes about which gospel was written first, all scholars agree that all four of the gospels were completed and published between the AD 40s and AD 90 while plenty of eyewitnesses to the events were still alive. The existence of eyewitnesses lends credibility to the gospel accounts. And we know, "All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness" (2 Timothy 3:16). More important than knowing which one was written first, we should challenge ourselves to understand the truths contained in the Gospels. The Gospels reveal God's character and Jesus' sacrificial love for us (cf. 1 John 4:10–17). They invite us to experience a relationship with Him and reflect on the implications of His love in our lives. Recognizing the Gospels as God’s holy words encourages us to approach them with reverence, seeking not just knowledge but transformation. By engaging with the text, we can grow in faith, understanding the significance of Jesus' teachings and His call to live according to His example.