Psalm
Revelation 5:8
When He took it, the four living creatures and the twenty-four elders fell down before the Lamb, each with a harp, and golden bowls that were full of incense, which represent the prayers of God's people.
Revelation 14:2-3
And I heard a sound from heaven like the roar of great waters and the rumbling of loud thunders. The sound that I heard was like that of harpists playing on their harps.
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