Examples

Allah is the Light of the heavens and the earth. His light is like a niche within which is a lamp, the lamp enclosed in glass, the glass shining like a brilliant star, lit from a blessed olive tree, neither of the east nor the west, whose oil glows even without fire. Light upon light. Allah guides to His light whom He wills. Allah sets forth parables for humanity.

24:35Allah is the Light of the heavens and the earth. The similitude of His light is as a niche wherein is a lamp. The lamp is in a glass. The glass is as it were a shining star. (This lamp is) kindled from a blessed tree, an olive neither of the East nor of the West, whose oil would almost glow forth (of itself) though no fire touched it. Light upon light. Allah guideth unto His light whom He will. And Allah speaketh to mankind in allegories, for Allah is Knower of all things.