Revelation 5:8

And, when He took the book, the four living creatures and the twenty-four elders fell down before the Lamb, having, each, a harp, and golden bowls full of incense, which are the prayers of the saints.

Revelation 14:2-3

And I heard a voice out of Heaven, as a voice of many waters, and as a voice of great thunder; and the voice which I heard was as that of harpers, harping with their harps.

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