Revelation 5:8

And when he had taken the book, the four living beings and the four and twenty presbyters prostrated themselves before the lamb, having each harps, and vases of gold, full of perfumes smoaking, which are the prayers of the saints.

Revelation 14:2-3

And I heard a voice from heaven, as the sound of many waters, and as the roar of loud thunder; and I heard the sound of harpers harping on their harps:

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