مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 268
Knowledge
Chapter - Section 3
وَعَنْ أَبِي الدَّرْدَاءِ قَالَ: إِنَّ مِنْ أَشَرِّ النَّاسِ عِنْدَ اللَّهِ مَنْزِلَةً يَوْمَ الْقِيَامَةِ: عَالِمٌ لَا ينْتَفع بِعِلْمِهِ . رَوَاهُ الدَّارمِيّ
Abu Darda’ said that the one who would have the worst position in God’s sight on the day of resurrection would be a learned man who did not profit from his learning.” Darimi transmitted it.
Mishkat al-Masabih, 268ضَعِيف جدا (الألباني)