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This verse expresses how Allah Almighty values the pleasure and happiness of His Prophet صَلَّى الـلّٰـهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم; the Beloved Prophet صَلَّى الـلّٰـهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم was saddened due to the Companions رَضِىَ الـلّٰـهُ عَـنْهُم so Allah Almighty tested them with some suffering and then valued their sacrifice and sincerity, by declaring their forgiveness to bring comfort to their hearts, as their mistake was not with evil intent, rather it was an error of judgement.