On the first Easter Sunday evening, Jesus appeared to the disciples. He proved His physical presence by inviting them to inspect His wounds and eating fish with them. Then He explained the reason for His death and resurrection.
Luke 24:46-48 says, "He told them, ‘This is what is written: the Messiah will suffer and rise from the dead on the third day, and repentance for the forgiveness of sins will be preached in His name to all nations, beginning at Jerusalem. You are witnesses of these things.'"