Allah is the Light of the heavens and the earth. The similitude of His light is as a lustrous niche, wherein is a lamp. The lamp is in a glass. The glass is as it were a glittering star. It is lit from a blessed tree — an olive — neither of the east nor of the west, whose oil would well-nigh glow forth even though fire touched it not. Light upon light! Allah guides to His light whomsoever He will. And Allah sets forth parables to men, and Allah knows all things full well.
[ Surah An-Nur Verse 35 Holy Quran ]