What is the wisdom behind the abrogation of the Qur'an, is it a manifestation of "bada'," what is the ruling on the verses that were not compiled when the Qur'an was gathered, and what is the relationship of that to its descent as a whole to the heaven before its gradual descent?

The definition of abrogation, its types, and its wisdom have been previously explained. This includes a refutation of those who claim that abrogation is 'bada'' (a change of mind or an unexpected disclosure), and that 'bada'' is not permissible for Allah. As for the verses that were not collected during the compilation of the Quran, there are no verses that were not collected; rather, the entire Quran was collected and preserved.