In this chapter, we see the preparation for the pouring out of God’s final judgements. We witness the outpouring of praise to God of the 144,000 of the redeemed.
“1Then I saw another portent in heaven, great and amazing: seven angels with seven plagues, which are the last, for with them the wrath of God is ended.
Revelation 15:1-2
2And I saw what appeared to be a sea of glass mixed with fire, and those who had conquered the beast and its image and the number of its name, standing beside the sea of glass with harps of God in their hands.”