How do we know that something is true? One of the most universal evidences of truth is what we call eyewitness testimony. We look to people who were there when an event happened, we listen to their accounts and their similarities. Throughout history, people have looked to how many eyewitness accounts we have of an event, how close to the event those accounts are, and how similar they are to validate what happened.
When we think about the importance of eyewitness testimony to truth, it's no surprise that we start to see statements like these in Scripture:
3 For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures, 5 and that he appeared to Cephas, and then to the Twelve. 6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep. 7 Then he appeared to James, then to all the apostles, 8 and last of all he appeared to me also, as to one abnormally born. (1 Corinthians 15:3-8)
Here, Paul explains that he is passing on eyewitness testimony that was given to him, and there are four elements to it:
Jesus was buried.