2 Bible Verses about Sea Of Glass

I saw what looked like a sea of glass mingled with fire. Those who were victorious 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 harps (written Word) of God.

A sea of crystal like glass was in front of the throne. In the center around the throne were four living creatures full of eyes in front and behind.