تفسير : (reward) this is a reward for the inhabitants of the garden (for what they used do) and say of good things in the life of the world.
Jalāl al-Dīn al-Maḥallī
تفسير : a reward (jazā’an is an object denoting reason or a verbal noun, with the operator being an implicit [verb], in other words, ‘we have appointed for them the mentioned as a reward’ or ‘we have rewarded them [this]’) for what they used to do.