عَنْ جُنْدُبٍ رَضِيَ اللهُ عَنْهُ
أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ حَدَّثَ (أَنْ رجُلاً قال: واللهِ لا يَغْفِرُ اللهُ لِفُلانٍ وإِنَّ اللهَ تَعَالَى قَالَ: مَنْ ذَا الَّذِي يَتَأَلَّى عَلَيَّ أَنْ لا أَغْفِرَ لِفُلان، فَإِنِّي قَدْ غَفَرْتُ لِفُلانٍ، وأَحْبَطْتُ عَمَلَكَ (أَوْ كَمَا قَال
The Messenger of Allah (sallallahu alayhi wa sallam) related: A man said: By Allah, Allah will not forgive So-and-so. At this Allah the Almighty said: Who is he who swears by Me that I will not forgive So-and-so? Verily I have forgiven So-and-so and have nullified your [own good] deeds (1) (or as he said [it]). (1) A similar Hadith, which is given by Abu Dawud, indicates that the person referred to was a goldly man whose previous good deeds were brought to nought through presuming to declare that Allah would not forgive someone’s bad deeds. It was related by Muslim.