Then I saw another great and awe-inspiring sign in heaven. There were seven angels with seven plagues—and these are the last, for with them God's anger is brought to an end.
References for Revelation 15:1
Then I saw what appeared to be a sea of glass mixed with fire. Those who gained victory over the beast, its image, and the number of its name were standing by the glass sea, holding harps from God.
They sing the song of Moses, God's servant, and the song of the Lamb, saying, "Great and awe-inspiring are your works, Lord God Almighty. Just and true are your ways, king of the nations.
Who won't fear you, Lord, and glorify your name? You alone are holy. All nations will come and fall down in worship before you, for your acts of justice have been revealed."
After this I looked, and the temple in heaven—that is, the tent of witness—was opened.
References for Revelation 15:5
The seven angels, who have the seven plagues, came out of the temple. They were clothed in pure bright linen and had gold sashes around their waists.
Then one of the four living creatures gave the seven angels seven gold bowls full of the anger of the God who lives forever and always.
The temple was filled with smoke from God's glory and power, and no one could go into the temple until the seven plagues of the seven last angels were brought to an end.