Allah 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.
(This lamp is found) in houses which Allah hath allowed to be exalted and that His name shall be remembered therein. Therein do offer praise to Him at morning and evening.
Sura Nur 24:36-37
Translation by Pickthall
Ismailimail 