Abu al-Qasim Mahmud ibn Umar al-Zamakhshari (Arabic: الزمخشري; 1074 –1143) was a medieval Muslim scholar of Iranian descent. He travelled to Makkah and settled there for five years and has been known since then as 'Jar Allah' (God's Neighbor). He was a Mu'tazilite theologian, linguist, poet and interpreter of the Quran. He is best known for his book Al-Kashshaf, which interprets and linguistically analyzes Quranic expressions and the use of figurative speech for conveying meaning. This work is a primary source for all major linguists; however, some of its Mu’tazila philosophical ideas were rejected by Ibn Kathir. Source: Wikipedia (en)