وَلَسَوْفَ يَرْضَىٰ
And surely he will be pleased. (92:21)
The emphatic lām and sawfa make the future prospect a forceful assurance. The understood subject continues the description of al-atqā, so the promise closes the account of giving and sincerity.
The rhetorical purpose is not to calculate a date from sawfa. It is to end the passage with hope and an outcome fitting the intention described immediately before.
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Supplementary Practice 27 — Comparative Rhetoric of Sūrat al-Shams and Sūrat al-Layl
وَلَسَوْفَ يَرْضَىٰ
And surely he will be pleased. (92:21)
The emphatic lām and sawfa make the future prospect a forceful assurance. The understood subject continues the description of al-atqā, so the promise closes the account of giving and sincerity.
The rhetorical purpose is not to calculate a date from sawfa. It is to end the passage with hope and an outcome fitting the intention described immediately before.