Revelation 4:6

and before the throne there was as it were a sea of glass like to crystal; and in the middle before the throne, and around the throne, were four living creatures full of eyes before and behind.

Revelation 5:6

And I saw, between the throne and the four living creatures and the elders, a Lamb standing, as if it had been slain, having seven horns, and seven eyes, which are the seven spirits of God sent forth into all the earth.

Revelation 15:2

And I saw as it were a sea of glass mingled with fire, and those who had gained the victory over the beast, and over his image, and over the number of his name, standing at the sea of glass, having harps of God.

Revelation 7:11

And all the angels were standing around the throne and the elders and the four living creatures, and they fell before the throne on their faces, and worshipped God,

Revelation 14:3

And they sing a new song before the throne, and before the four living creatures and the elders; and no one was able to learn the song but the hundred and fortyfour thousand, who were redeemed from the earth.

Revelation 15:7

And one of the four living creatures gave to the seven angels seven golden vials, full of the wrath of God, who liveth for ever and ever.

Revelation 19:4

And the twentyfour elders and the four living creatures fell down and worshipped God that sat on the throne, saying, Amen, hallelujah!

Revelation 4:8-9

And the four living creatures, having each of them six wings, around and within are full of eyes; and they have no rest day and night, saying, Holy, holy, holy, Lord God Almighty, who was, and who is, and who is to come.

Revelation 5:14-1

And the four living creatures said Amen. And the elders fell down and worshipped.

Revelation 7:17

for the Lamb who is in the midst before the throne is a shepherd to them, and leadeth them to the fountains of the waters of life; and God will wipe away every tear from their eyes.

Revelation 21:11

having the glory of God; her light was like to a most precious stone, as it were a jasper stone, clear as crystal;

Revelation 21:18

And the material of its wall was jasper; and the city was of pure gold, like to clear glass.

Revelation 21:21

And the twelve gates were twelve pearls; every several gate was of one pearl. And the street of the city was pure gold, like transparent glass.

Revelation 22:1

And he showed me a river of water of life, clear as crystal, coming out of the throne of God and of the Lamb.

Treasury of Scripture Knowledge

Summary

And before the throne there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne, were four beasts full of eyes before and behind.

Bible References

A sea

Revelation 15:2
And I saw as it were a sea of glass mingled with fire, and those who had gained the victory over the beast, and over his image, and over the number of his name, standing at the sea of glass, having harps of God.

Crystal

Revelation 21:11
having the glory of God; her light was like to a most precious stone, as it were a jasper stone, clear as crystal;
Revelation 22:1
And he showed me a river of water of life, clear as crystal, coming out of the throne of God and of the Lamb.

The midst

Revelation 5:6
And I saw, between the throne and the four living creatures and the elders, a Lamb standing, as if it had been slain, having seven horns, and seven eyes, which are the seven spirits of God sent forth into all the earth.
Revelation 7:17
for the Lamb who is in the midst before the throne is a shepherd to them, and leadeth them to the fountains of the waters of life; and God will wipe away every tear from their eyes.

Four beasts

Revelation 4:8
And the four living creatures, having each of them six wings, around and within are full of eyes; and they have no rest day and night, saying, Holy, holy, holy, Lord God Almighty, who was, and who is, and who is to come.
Revelation 5:6
And I saw, between the throne and the four living creatures and the elders, a Lamb standing, as if it had been slain, having seven horns, and seven eyes, which are the seven spirits of God sent forth into all the earth.
Revelation 6:1
And I saw when the Lamb opened one of the seven seals, and I heard, as it were the voice of thunder, one of the four living creatures saying, Come!
Revelation 7:11
And all the angels were standing around the throne and the elders and the four living creatures, and they fell before the throne on their faces, and worshipped God,
Revelation 14:3
And they sing a new song before the throne, and before the four living creatures and the elders; and no one was able to learn the song but the hundred and fortyfour thousand, who were redeemed from the earth.
Revelation 15:7
And one of the four living creatures gave to the seven angels seven golden vials, full of the wrath of God, who liveth for ever and ever.
Revelation 19:4
And the twentyfour elders and the four living creatures fell down and worshipped God that sat on the throne, saying, Amen, hallelujah!

Full

Revelation 4:8
And the four living creatures, having each of them six wings, around and within are full of eyes; and they have no rest day and night, saying, Holy, holy, holy, Lord God Almighty, who was, and who is, and who is to come.