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

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.

Treasury of Scripture Knowledge

Summary

Praise the LORD with harp: sing unto him with the psaltery and an instrument of ten strings.

Bible References

Praise

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
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.