"Allah is the Light of the heavens and the earth. The parable of His Light is as if there were a Niche and within it a lamp: the Lamp enclosed in Glass: the glass as it were a brilliant star: lit from a blessed Tree an Olive neither of the East nor of the West whose Oil is well-nigh luminous though fire scarce touched it: Light upon Light! Allah doth guide whom He will to His Light. Allah doth set forth Parables for men: and Allah doth know all things."
For Arabic: http://quran.com/24/35