In regard to the contextual meaning and structure of the Qur'an, both can be devided into three categories: 1. the integrated chapters revealed in a single phase of revelation, 2. the chapters whose thematic units (ruku`at) were revealed successively, and 3. the compiled chapters whose thematic units have not been revealed successively, rather, some verses from other chapters were revealed in between. The Prophet has always referred this revelation and gradual communication under the instruction and supervision of Divine inspiration to the instantaneous (daf` ) revelation of the Qur'an on Laylat al-Qadr (the Night of Ordainment).
On that basis, he has determined, compiled, and arranged the chapters and the verses in a completely organized oral collection called the ''Qur'an", with the written text named the ''Mus haf''.
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