عَنْ جُنْدُبِ بْنِ عَبْدِ اللّهِ رَضِيَ اللّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللّهِ صَلَّى اللّهُ عَلَيْهِ وَسَلَّمَ: «قَالَ رَجُلٌ: وَاللهِ، لا يَغْفِرُ اللّهُ لِفُلانٍ، فَقَالَ اللّهُ عَزَّ وَجَلَّ: مَنْ ذَا الَّذِي يَتَأَلَّى عَلَيَّ أَلَّا أَغْفِرَ لِفُلانٍ؟ إِنِّي قَدْ غَفَرْتُ لَهُ، وَأَحْبَطْتُ عَمَلَكَ» رَوَاهُ مُسْلِمٌ
Jundub ibn Abdullah (may Allah be pleased with him) reported that the Messenger of Allah (peace and blessings be upon him) said: "A man said: By Allah, Allah will not forgive so-and-so. So Allah (the Mighty and Majestic) said: Who is this who swears by Me that I will not forgive so-and-so? Indeed I have forgiven him and nullified your deeds." Reported by Muslim.
الشرح · explanation
يتألّى: يحلف. أحبطت عملك: أي أبطلت ثوابه.
"swears": takes an oath. "nullified your deeds": that is, voided their reward.
الدروس · lessons
سعة رحمة اللّه ومغفرته لعباده. الترهيب من احتقار أحد من المسلمين. عدم الجزم بحكم ممّا يختص اللّه عزّ وجلّ به، لما فيه من سوء الأدب مع اللّه تعالى.
The vastness of Allah's mercy and forgiveness toward His servants. A stern warning against despising any of the Muslims. Not passing definitive judgment on what belongs exclusively to Allah (the Mighty and Majestic), because of the ill manners toward Allah the Exalted that it entails.