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:21126a –
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السيوطي:٢١١٢٦a –

"مَنْ تَعَلَّمَ صَرْفَ الكَلَامِ لِيَسْبِى بِهِ قُلُوبَ النَّاس لَمْ يَقْبَلْ اللهُ مِنْه (يَوْمَ الْقِيَامَةِ) صَرْفًا وَلَا عَدْلًا".  

[د] أبو داود [هب] البيهقى في شعب الإيمان عن أَبي هريرة

See similar narrations below:

Collected by Abū Dāwūd
abudawud:5006 – Ibn al-Sarḥ > Wahb > ʿAbdullāh b. al-Musayyab > al-Ḍaḥḥāk b. Shuraḥbīl > Abū Hurayrah

The Prophet ﷺ said: On the Day of resurrection Allah will not accept repentance or ransom from him who learns excellence of speech to captivate thereby the hearts of men, or of people.  

أبو داود:٥٠٠٦ – حَدَّثَنَا ابْنُ السَّرْحِ حَدَّثَنَا وَهْبٌ عَنْ عَبْدِ اللَّهِ بْنِ الْمُسَيَّبِ عَنِ الضَّحَّاكِ بْنِ شُرَحْبِيلَ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ تَعَلَّمَ صَرْفَ الْكَلاَمِ لِيَسْبِيَ بِهِ قُلُوبَ الرِّجَالِ أَوِ النَّاسِ لَمْ يَقْبَلِ اللَّهُ مِنْهُ يَوْمَ الْقِيَامَةِ صَرْفًا وَلاَ عَدْلاً