Abu Dardaa (May Allah be pleased with him) said:
” تعلموا قبل أن يرفع العلم، إنّ رفع العلم ذهابُ العلماءِ “
حلية الأولياء (1/213)
“Learn before knowledge is lifted (from you). For indeed knowledge is lifted with the death of scholars.”
Source: Hilyatul Awliyaa 1/213