We certainly know that your heart is truly distressed by what they say.
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Qiraat
وَلَقَدْ نَعْلَمُ أَنَّكَ يَضِيقُ صَدْرُكَ أي قلبك ; لأن الصدر محل القلب . بِمَا يَقُولُونَ أي بما تسمعه من تكذيبك ورد قولك , وتناله .ويناله أصحابك من أعدائك .
He has revealed to you ˹O Prophet˺ the Book in truth, confirming what came before it, as He revealed the Torah and the Gospel