Revelation 13:9

If anyone has an ear, let him hear.

Revelation 2:7

He who has an ear, let him hear what the Spirit says to the assemblies. To him who overcomes I will give to eat of the tree of life, which is in the Paradise of my God.

Revelation 2:11

He who has an ear, let him hear what the Spirit says to the assemblies. He who overcomes won't be harmed by the second death.

Revelation 2:17

He who has an ear, let him hear what the Spirit says to the assemblies. To him who overcomes, to him I will give of the hidden manna, and I will give him a white stone, and on the stone a new name written, which no one knows but he who receives it.

Revelation 2:29

He who has an ear, let him hear what the Spirit says to the assemblies.

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