According to Ibn Kathir's commentary, the Surah takes its name from the 25 ayah in which the word Al Qasas occurs. Lexically, “qasas” means to relate events in their proper sequence. Thus, from the viewpoint of the meaning too, this word can be a suitable title for this Surah, for in it the detailed story of the Prophet Moses has been related ,also it includes story of Qarun from verse 76 to verse 83 explaining how Qarun was proud of him self thinking that his huge wealth earned by his own science, denying the grace of God on him and latter God destroyed him with his wealth underground.
Surah 26: ash-Shu’ara’ (The Poets), Surah 27: an-Naml (The Ants) and Surah 28: al Qasas (The Story) were sent down one after the other (according to Ibn Abbas and Jabir Zaid). The language, the style and the theme also show that the period of the revelation of these three Surahs is nearly the same. Another reason for their close resemblance is that the different parts of the story of Prophet Musa (a) are mentioned in these Surahs together to make up a complete story. These Surahs are revealed during the middle stage of the prophet Muhammad (s)’s residence at Makkah
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