And I beheld, and, lo, in the midst of the throne and of the four living creatures, and in the midst of the elders, stood a Lamb as though it had been slain, having seven horns and seven eyes, which are the seven Spirits of God sent forth into all the earth.
All Commentaries on Revelation 5:6 Go To Revelation 5
Irenaeus of Lyons
AD 202
"And after these things, seeing the same Lord in a second vision, he says: "For I saw in the midst of the throne, and of the four living creatures, and in the midst of the elders, a Lamb standing as it had been slain, having seven horns, and seven eyes, which are the seven spirits of God, sent forth into all the earth."