[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.