Al-Mukhtasar

بِسْمِ ٱللَّهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ إِذَا ٱلشَّمْسُ كُوِّرَتْ ﴿١﴾

When the mass of the sun is gathered and its light vanishes.