محمد بن إسماعيل البخاري
"Asbāb al-nuzūl" (occasions or circumstances of revelation) is a secondary genre of Qur'anic exegesis ("tafsir") directed at establishing the context in which specific verses of the Qur'an were revealed. Though of some use in reconstructing the Qur'an's historicity, "asbāb" is by nature an exegetical rather than a historiographical genre, and as such usually associates the verses it explicates with general situations rather than specific events. A hadith recorded by Muhammad al-Bukhari which narrates the occasion of revelation of this surah is as follows.