Jesus healed a leper then told him to see a priest. Why?

Jesus healed a leper then told him to see a priest. Why?

Jesus healed a leper. But if he was healed, why did Jesus him to see a priest? The event is recorded in three of the Gospels. And they all tell it pretty much the same way. All three leave us with questions. Why did the healed man have to go see a Jewish priest? Why was that necessary? And to make it even more odd, Jesus told the man not to tell anyone how he was healed! What’s going on?