Abu al-Darda (RA) said, “Among the worst of people in status before Allah on the Day of Resurrection is a scholar who does not benefit from his knowledge.” [1]
[1] Al-Marwazi, Abdullah ibn al-Mubarak, Al-Zuhd wa al-Raqaiq, p. 59, al-Maktabah al-Haqqaniyyah, Peshawar, n.d.