Revelation 4:1-3

After these things I looked, and behold, a door standing open in heaven, and the first voice which I had heard, like the sound of a trumpet speaking with me, said, “Come up here, and I will show you what must take place after these things.”

Immediately I was in the Spirit; and behold, a throne was standing in heaven, and someone was sitting on the throne.

And He who was sitting was like a jasper stone and a sardius in appearance; and there was a rainbow around the throne, like an emerald in appearance.