In this reading, the word jazāʾan is a circumstantive and al-ḥusnā refers to Paradise.
جَزَاءُ الحُسْنَى
jazāʾu l-ḥusnā
"He will have the reward for the best actions" or "He will have a reward: the Best (Abode)"
In this reading, jazāʾ is annexed to al-ḥusnā, which refers to the people's good traits and acts. The latter word may also be an appositive, and the tanwin was elided.
وضاحت:
These readings amount to the same meaning, or provide complementary meanings [al-Mahdawi].
He has revealed to you ˹O Prophet˺ the Book in truth, confirming what came before it, as He revealed the Torah and the Gospel
وضاحت:
These readings amount to the same meaning, or provide complementary meanings [al-Mahdawi].