“...that it is they who are successful” OR “for they are the successful”
In this reading, the following phrase clarifies the 'reward' described at the beginning of the ayah, or there is an implied particle lam to express cause.
إِنَّهُمۡ
innahum
“It is they who are successful”
In this reading, this forms an independent sentence, reinforcing the meaning that the steadfast are rewarded.
Explanation
These readings amount to the same meaning [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
Explanation
These readings amount to the same meaning [al-Mahdawi].