Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:16271a –
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السيوطي:١٦٢٧١a –

"قَال رَجلٌ: لَا يَغْفِرُ اللهُ لِفلانٍ, فَأوْحَى الله إِلى نبيٍّ مِنَ الأنْبيَاءِ: إِنَّهَا خَطِيئَة فَليَسْتَقْبِل العَمَلَ".  

[طب] الطبرانى في الكبير عن جندب

See similar narrations below:

Collected by Ṭabarānī
tabarani:1680 – Muḥammad b. al-ʿAbbās al-Muʾaddib > ʿAffān > Ḥammād b. Salamah > Abū ʿImrān > Jundub > a man Ālá

[Machine] That Allah will not forgive so-and-so, then Allah revealed to His Prophet or to a Prophet that it (the sin) is as sinful as a major sin, so let him face the consequences of his actions.  

الطبراني:١٦٨٠ – حَدَّثَنَا مُحَمَّدُ بْنُ الْعَبَّاسِ الْمُؤَدِّبُ ثنا عَفَّانُ ثنا حَمَّادُ بْنُ سَلَمَةَ ثنا أَبُو عِمْرَانَ عَنْ جُنْدُبٍ أَنَّ رَجُلًا آلَى

أَنْ لَا يَغْفِرَ اللهُ لِفُلَانٍ فَأَوْحَى الله ﷻ إِلَى نَبِيِّهِ ﷺ أَوْ إِلَى نَبِيٍّ أَنَّهَا بِمَنْزِلَةِ الْخَطِيئَةِ فَلْيَسْتَقْبِلِ الْعَمَلَ