What message will the 144,000 carry during the tribulation?
The sealed ones will carry the gospel of the Kingdom, not the gospel of grace of the church age. This basic message, instituted by John the Baptist and preached by Christ and the Twelve, declares that the King is coming, which is good news for that period.
Les explains that the sealed ones will encircle the globe and carry not the gospel of grace that was preached during the church age, but rather the basic message John the Baptist instituted and that Christ and the Twelve preached: the gospel of the Kingdom. That message declares the King is coming, which is good news for that period of history. This is distinct from the gospel of grace and returns to the foundational message for that future time.