Tafseer is the arabic word for exegesis of the Quran. Mufasireen (authors of tafseer) explain and interpret the Quran through many ways. Firstly, interpreting the Quran by the Quran i.e a Quranic verse may be explained by another verse in a different Surah of the Quran. Secondly, a verse may be explanied by ahadith - sayings and actions of the Prophet Muhammad (صلى الله عليه وسلم). Furthermore a verse may be explained linguistically, i.e why Allah chose certain words etc, it may be explained by its reason for revelation (asbaab al-nuzool) and the context of it's revelation. This is but a brief introduction to tafseer.