The Qur'an has been revealed for guidance, for all times and situations to come. However, various ayat were revealed at a particular time in history and in particular circumstances. The Arabic word sabab (pl. asbab) means reason, cause and 'marifa asbab al-nuzul' is the knowledge about the reasons of the revelations, i.e. the knowledge about the particular events and circumstances in history that are related to the revelation of particular passages from the Qur'an.

Wahidi (d. 468/1075), one of the best classical scholars in this field wrote: 'The knowledge about Tafsir of the ayat is not possible without occupying oneself with their stories and explanation of (the reasons) for their revelation.' [Asbab alnuzul, by al-Wahidi al-Nisaburi. Cairo, 1968, p 4] Knowledge about the asbab al-nuzul helps one to understand the circumstances in which a particular revelation occurred, which sheds light on its implications and gives guidance to the explanation (tafsir) and application of the aya in question for other situations.

In particular, knowledge about the asbab al-nuzul helps one to understand:

 The direct and immediate meaning and implication of an aya, as it can be seen within its original context.

 The imminent reason underlying a legal ruling.

 The original intent of the aya.

 Whether the meaning of an aya is specific or of general application, and if so, under which circumstances it is to be applied.