Fifth: That He is Light, or that He is called Light, was not disputed by the early Jahmiyyah and their leading authorities who denied the divine attributes. Rather, they said that He is Light.

Imam Ahmad said in his Refutation of the Jahmiyyah:

“We said to the Jahmiyyah, when they claimed that Allah is everywhere and that no place is without Him: ‘Tell us about the words of Allah—exalted be His praise:

“When his Lord manifested Himself to the mountain, He made it crumble.” [al-A‘rāf 143]

Why did He manifest Himself to the mountain if, as you claim, He was in it? If He had been in it as you claim, He would not have manifested Himself to something in which He was already present. But Allah, blessed and exalted, is upon the Throne, and He manifested Himself to something in which He was not present. The mountain saw something it had never seen before.’ And we said