They were holding God’s harps, and they sang the song of Moses, the servant of God, and the song of the Lamb. (Revelation 15:3)
First of all, we know what St. John means by a ‘harp,’ right? A ten-stringed lyre? Correct: Living according to the Ten Commandments.
They sang the song of Moses. Remember how we discussed the relationship between the Lamb of God and the ancient Passover? The song of Moses celebrates what event? Horse and chariot He has cast into the sea. Exodus 15. The crossing of the Red Sea. The liberation of Israel.
The Israelites marched dry-shod through the sea, with the water piled up like a mound, with the floodwaters congealed to their right and to their left. God works His miracles of deliverance.
Where were they headed? To quote the song of Moses: To the mountain of God’s inheritance, to the sanctuary which the Lord’s hands established.
The song of the Lamb resounds in the eternal sanctuary: God is just; God is wonderful. Who will not glorify the Almighty? Who has done such deeds of loving kindness, redeeming the human race by the blood of the innocent Christ!
In every tabernacle in every parish church or chapel all over the world, the Lamb resides. He dwells with us, and He works His miracles of deliverance.