ثُمَّ كَلَّا سَوْفَ تَعْلَمُونَ
Compare 102:4 and 102:3
highlighted words differ between verses
كَلَّا سَوْفَ تَعْلَمُونَ
Both verses use 'kalla sawfa ta'lamun' but 102:4 adds 'thumma kalla' at the start, escalating the warning — omitting 'thumma' is a frequent recitation error.
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