Tafsir is an arabic word تفسير which is derived from the root 'fassara' which means to "explain" or to "expound". It is best understood as 'explanation' or 'interpretation' of the Qur'an. Ibn Kathir wrote a famous commentary of the Qur'an named Tafsir ibn Kathir which linked certain Hadith, or sayings of Muhammad, and sayings of the sahaba to verses of the Qur'an, in explanation. Tafsir Ibn Kathir is famous all over the Muslim world and among Muslims in the Western world, and is one of the most widely used explanations of the Qu'ran today. This site introduces the reader to one of the most Authentic books for explaining the Quran using both arabic and english text to grasp the understanding of the Quran.