hadith
1657
۞
The Prophet (SAWA) said, ‘The person to experience the greatest pain on the Day of Resurrection will be the scholar who did not benefit from his own knowledge.
رسولُ اللهِ (صَلَّيَ اللهُ عَلَيهِ وَ آلِهِ) : أشدُّ النّاسِ عَذاباً يَومَ القيامةِ عالِمٌ لم يَنفَعْهُ عِلمُهُ .