Revelation 15:2

And I saw the semblance of a glassy sea, mingled with fire; and standing by this glassy sea, with harps of God, were those who came off conquerors from the beast and from his image and from the cipher of his name.

Revelation 4:6

And in front of the throne as it seemed, a glassy sea like crystal; and in the midst of the throne and encircling it are four Living Creatures, full of eyes before and behind.

Revelation 5:8

When he took the book, the four Living Creatures and the four and twenty Elders fell down before the Lamb. And each had a harp and a golden bowls full of incense, which are the prayers of the saints.

Revelation 12:11

And they have conquered him by the blood of the Lamb, And by the word of their testimony; And they loved not their life, even unto death.

Revelation 21:18

And its wall is made of jasper; but the city is of pure gold, like pure glass.

Matthew 3:11

I indeed am baptizing you in water, unto repentance; but One is coming after me, mightier than I, whose sandals I am not worthy to carry. He will baptize you in the Holy Spirit and in fire.

1 Peter 1:7

These are in order that the test of your faith, more precious than gold that is perishable and yet is tested by fire, may redound to praise and glory and honor, at the revelation of Jesus Christ.

1 Peter 4:12

Do not think it strange, beloved, that a fiery ordeal has come to test you, as though some surprising thing had befallen you.

Revelation 11:11-12

And after three days and a half the breath of life from God entered into them, and they stood on their feet, and great fear fell upon them.

Revelation 13:14-5

And he deceives those who dwell on the earth, because of the miracles, which he is permitted to perform in the sight of the beast. He tells those who live on the earth to make an image to the beast who had the sword-stroke, yet lived.

Revelation 19:1-7

After this I heard the semblance of the mighty voice of a great multitude in heaven, crying. "Hallelujah! Salvation and glory and power Unto the Lord our God!

Treasury of Scripture Knowledge

Summary

And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.

Bible References

A sea

Revelation 4:6
And in front of the throne as it seemed, a glassy sea like crystal; and in the midst of the throne and encircling it are four Living Creatures, full of eyes before and behind.
Revelation 21:18
And its wall is made of jasper; but the city is of pure gold, like pure glass.

Mingled

Matthew 3:11
I indeed am baptizing you in water, unto repentance; but One is coming after me, mightier than I, whose sandals I am not worthy to carry. He will baptize you in the Holy Spirit and in fire.
1 Peter 1:7
These are in order that the test of your faith, more precious than gold that is perishable and yet is tested by fire, may redound to praise and glory and honor, at the revelation of Jesus Christ.
1 Peter 4:12
Do not think it strange, beloved, that a fiery ordeal has come to test you, as though some surprising thing had befallen you.

That had

Revelation 11:11
And after three days and a half the breath of life from God entered into them, and they stood on their feet, and great fear fell upon them.
Revelation 12:11
And they have conquered him by the blood of the Lamb, And by the word of their testimony; And they loved not their life, even unto death.
Revelation 13:14
And he deceives those who dwell on the earth, because of the miracles, which he is permitted to perform in the sight of the beast. He tells those who live on the earth to make an image to the beast who had the sword-stroke, yet lived.
Revelation 14:1
And I looked, and lo, there was the Lamb standing on Mount Zion, and with were a hundred and forty and four thousand who had his name and his Father's name written on their foreheads.

Having

Revelation 5:8
When he took the book, the four Living Creatures and the four and twenty Elders fell down before the Lamb. And each had a harp and a golden bowls full of incense, which are the prayers of the saints.
Revelation 14:2
And I heard a voice from heaven like the voice of many waters, and the voice of a great thunder; and I heard the voice of harpers harping on their harps.
Revelation 19:1
After this I heard the semblance of the mighty voice of a great multitude in heaven, crying. "Hallelujah! Salvation and glory and power Unto the Lord our God!