Revelation 4:1-3 CSB
After this I looked, and there in heaven was an open door. The first voice that I had heard speaking to me like a trumpet said, “Come up here, and I will show you what must take place after this.”
Immediately I was in the Spirit, and there was a throne in heaven and someone was seated on it. The one seated there had the appearance of jasper and carnelian stone. A rainbow that had the appearance of an emerald surrounded the throne.
CSB: Christian Standard Bible