What does Revelation 15:2 mean?
John looked at what appeared to be a sea of glass mingled with fire. Revelation 4:6 identifies a sea of glass lying before God's throne. In Old Testament times priests washed in a bronze basin before offering sacrifices. However, there is no need of cleansing or sacrificing in heaven, so a sea of glass appears before God's throne.The fire in the sea of glass may represent divine judgment that is about to fall on the wicked when the seven angels release the seven plagues mentioned in verse 1. The crowd seen standing before the sea of glass may be martyrs, or they may be survivors of the tribulation. This statement is contained in the part of Revelation which is not in any exact chronological order. Regardless, these crowd members are victors. They refused to worship the beast or his image. And they refused to receive the mark of the beast having his number: 666. This group of victors hold harps, indicating they are ready to celebrate.