[They will not taste therein death except the first death] - and there is no other death there; it is only this one death in the world.
[As a bounty from your Lord; that is the great attainment] - the great salvation from the Fire into Paradise.
Muhammad said: [As a bounty] is in the accusative case (mansub) meaning: that is by the bounty of God, i.e., He did that as a bounty from Him.
﴿لَا يَذُوقُونَ فِيهَا الْمَوْتَ إِلا الموتة الأولى﴾ وَلَيْسَ ثَمَّ موتَة، إِنَّمَا هِيَ هَذِه الموتة الْوَاحِدَة فِي الدُّنْيَا.
﴿فَضْلا مِنْ رَبِّكَ ذَلِكَ هُوَ الْفَوْز الْعَظِيم﴾ النجَاة الْعَظِيمَة من النَّار إِلَى الْجنَّة.
قَالَ مُحَمَّد: ﴿فضلا﴾ منصوبٌ بِمَعْنى: وَذَلِكَ بفضلٍ من الله، أَي: فعل ذَلِك مِنْهُ فضلا.
