The Lamb is standing on Mount Zion with 144,000 at His side. His name and His Father's name are on their foreheads. They sing a new song loud and clear before the throne. It is the song which only redeemed saints can sing. They are totally devoted to the Lamb, and follow Him wherever He goes. They are first fruits to God and to the Lamb, pointing to other redeemed ones to follow them. Now in heaven they know nothing but truth and righteousness.