Revelation 4:6

In front of the throne was what looked like a sea of glass, like crystal. Around the throne, in the middle of each side, were four animals covered with eyes in front and behind.

Revelation 5:6

Then I saw standing in the center of the throne and of the four animals and of the elders a Lamb which seemed to have been slaughtered. He had seven horns and seven eyes; these are the seven spirits of God, which are sent on errands to all parts of the earth.

Revelation 15:2

And I saw what looked like a sea of glass mixed with fire, and standing upon the sea of glass those who had come off victorious from the animal and its statue and the number corresponding to its name. They had harps that God had given them,

Revelation 7:11

Then all the angels stood around the throne and the elders and the four animals, and fell on their faces before the throne and worshiped God,

Revelation 14:3

They were singing a new song before the throne and the four animals and the elders, and no one could learn the song except the 144,000 who had been ransomed from the earth.

Revelation 15:7

Then one of the four animals gave the seven angels seven gold bowls full of the wrath of God who lives forever and ever,

Revelation 19:4

Then the twenty-four elders and the four animals fell down and worshiped God who was seated upon the throne. "Amen!" they said, "Praise the Lord!"

Revelation 4:8-9

The four animals have each of them six wings, and they are covered with eyes all over and underneath their wings. And day and night they never cease to say, "Holy, holy, holy is the Lord God, the Almighty, who was and is and is coming."

Revelation 5:14-1

The four animals said, "Amen!" And the elders fell down and worshiped.

Revelation 7:17

for the Lamb who is in the center of the throne will be their shepherd, and will guide them to springs of living water, and God will wipe every tear from their eyes."

Revelation 21:11

in all the glory of God. It shone with a radiance like that of some very precious stone, like jasper, clear as crystal.

Revelation 21:18

The material of the wall was jasper, but the city was pure gold, as transparent as glass.

Revelation 21:21

The twelve gates were twelve pearls; each gate made of a single pearl. The principal street of the city was pure gold, as transparent as glass.

Revelation 22:1

Then he showed me a river of living water, clear as crystal, which issued from 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 what looked like a sea of glass mixed with fire, and standing upon the sea of glass those who had come off victorious from the animal and its statue and the number corresponding to its name. They had harps that God had given them,

Crystal

Revelation 21:11
in all the glory of God. It shone with a radiance like that of some very precious stone, like jasper, clear as crystal.
Revelation 22:1
Then he showed me a river of living water, clear as crystal, which issued from the throne of God and of the Lamb,

The midst

Revelation 5:6
Then I saw standing in the center of the throne and of the four animals and of the elders a Lamb which seemed to have been slaughtered. He had seven horns and seven eyes; these are the seven spirits of God, which are sent on errands to all parts of the earth.
Revelation 7:17
for the Lamb who is in the center of the throne will be their shepherd, and will guide them to springs of living water, and God will wipe every tear from their eyes."

Four beasts

Revelation 4:8
The four animals have each of them six wings, and they are covered with eyes all over and underneath their wings. And day and night they never cease to say, "Holy, holy, holy is the Lord God, the Almighty, who was and is and is coming."
Revelation 5:6
Then I saw standing in the center of the throne and of the four animals and of the elders a Lamb which seemed to have been slaughtered. He had seven horns and seven eyes; these are the seven spirits of God, which are sent on errands to all parts of the earth.
Revelation 6:1
In my vision, when the Lamb broke the first of the seven seals, I heard the first of the four animals say with a voice like thunder, "Come!"
Revelation 7:11
Then all the angels stood around the throne and the elders and the four animals, and fell on their faces before the throne and worshiped God,
Revelation 14:3
They were singing a new song before the throne and the four animals and the elders, and no one could learn the song except the 144,000 who had been ransomed from the earth.
Revelation 15:7
Then one of the four animals gave the seven angels seven gold bowls full of the wrath of God who lives forever and ever,
Revelation 19:4
Then the twenty-four elders and the four animals fell down and worshiped God who was seated upon the throne. "Amen!" they said, "Praise the Lord!"

Full

Revelation 4:8
The four animals have each of them six wings, and they are covered with eyes all over and underneath their wings. And day and night they never cease to say, "Holy, holy, holy is the Lord God, the Almighty, who was and is and is coming."