Growing up as a skeptic, I never thought of the biblical narrative as an eyewitness account. Instead, I saw it as something more akin to religious mythology— a series of stories designed to make a point. But when I read through the Gospels (and then the letters that followed them), it appeared clear that the writers of Scripture identified themselves as eyewitnesses and viewed their writings as testimony. Peter identified himself as a “witness of the sufferings of Christ” (1 Pet. 5:1) and as one of many “eyewitnesses of His majesty” (2 Pet. 1:16–17). The apostle John claimed that he was writing as an eyewitness when he described the life and death of Jesus. He identified himself as “the disciple who is testifying to these things and wrote these things” (John 21:24), and said that he was reporting “what we have heard, what we have seen with our eyes, what we have looked at and touched with our hands” (1 John 1:1). The apostles saw themselves first and foremost as a group of eyewitnesses, and they understood that their shared observations were a powerful testimony to what they claimed to be true.
-J. Warner Wallace in Cold-Case Christianity: A Homicide Detective Investigates the Claims of the Gospels (Kindle Locations 1245-1253).