And they whose weight [of righteousness] is heavy in the balance - it is they, they who will have attained to a happy state;

Then those whose balance (of good deeds) is heavy,- they will attain salvation:

Then those whose scales are heavy, they are the successful.

Then those whose good deeds are heavy, those are the successful.

And those whose scales are heavy [with good deeds] - it is they who are the successful.