When Jesus rose from the dead on the third day, he confirmed his message just like every other prophet. Prophets from God must have some kind of sign, wonder, or short term prediction that they offer up. This way, people can know that the prophet is bringing a message from God.
"But you may wonder, 'How will we know whether or not a prophecy is from the LORD?' If the prophet speaks in the LORD's name but his prediction does not happen or come true, you will know that the LORD did not give that message. That prophet has spoken without My authority and need not be feared. (Deuteronomy 18:21-22 NLT)
Jesus offered only on sign to confirm that his message was from God.
But he answered them, “An evil and adulterous generation seeks for a sign, but no sign will be given to it except the sign of the prophet Jonah. For just as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth. (Matthew 12:39-40 ESV)
Jesus needed to die and, three days later, rise again. This was the sign he had offered. When he rose from the dead, he confirmed his message as true prophecy sent from God. He wasn’t only confirming what he had said, though, to confirm his message. His resurrection also confirmed what the prophets said about about the Messiah, the Christ who was to come. He needed to explain this to his disciples again after he was alive.
Then Jesus said to them, "You foolish people! You find it so hard to believe all that the prophets wrote in the Scriptures. Wasn't it clearly predicted that the Messiah would have to suffer all these things before entering His glory?" Then Jesus took them through the writings of Moses and all the prophets, explaining from all the Scriptures the things concerning Himself. (Luke 24:25-27 NLT)
Jesus’ resurrection confirmed what he had said about himself. Jesus’ resurrection confirmed what the prophets said about the Messiah (the Christ).
How about you? Do you believe “all that the prophets wrote in the Scriptures?” Do you believe that Jesus’ message was from God? Do you believe that Jesus is the Christ?