And I saw what appeared to be a sea of glass mingled with fire—and also 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.
Here we have the preparation of matters for the pouring out of the seven vials, which was committed to seven angels; and observe how these angels appeared to the apostle - in heaven; it was in a wonderful manner, and that upon account, 1. Of the work they had to do, which was to finish the destruction of antichrist.
Commenting on Revelation 15:1-4
And I saw, as it were, a sea of glass mingled with fire,.... Not baptism, but rather the blood of Christ, which may be compared to a sea, for its abundant virtue and efficacy in cleansing from all sin; and to a sea "of glass", since in it are clearly seen free justification, full pardon, peace and reconciliation; and may be said to be "mingled...
Verse 2. And I saw as it were a sea of glass. In , a similar vision is recorded--"And before the throne there was a sea of glass, like unto a crystal." . The sea of glass here means a sea, clear, pellucid, like glass: an expanse that seemed to be made of glass. There it was entirely clear; here it is mingled with fire. Mingled with fire.