What did Joel say people have to do once the King and Kingdom become a reality?

Les explains that Joel’s message applied to the future Kingdom economy, not to the present age of grace. Because Christ had not yet died, the offer of salvation had not been turned over to the whole world; it was still confined to Israel under the Law. Joel told the living world that when the King and Kingdom become a reality, they would have to call out to Jehovah God and could experience salvation. Les cautions that the wording is identical to Paul’s, but the circumstances and setting are totally different—one under grace, the other under the Kingdom economy. This same principle appears at Pentecost, where Peter addressed Jews only, not pagan Gentiles.