Ezekiel 1:28
The appearance of the brilliant light all around Him was like that of a rainbow in a cloud on a rainy day. This was the appearance of the likeness of the glory of the LORD. And when I saw it, I fell facedown and heard a voice speaking.

Revelation 4:3
The One seated there looked like jasper and ruby, and a rainbow that gleamed like an emerald encircled the throne.

Revelation 10:1
Then I saw another mighty angel coming down from heaven, wrapped in a cloud, with a rainbow above his head. His face was like the sun, and his legs like pillars of fire.