Abu Dharr Radhiyallahu ‘Anhu reported: Rasulullah Sallallahu ‘Alaihi wa Sallam, said,
“Verily, you are in a time of many scholars and few preachers. Whoever leaves a tenth of what he knows will be ruined. There will come a time for people of few (true) scholars and many preachers. Whoever adheres to a tenth of what he knows will be saved.”
Source: Musnad Aḥmad 21372
عَنْ أَبِي ذَرٍّ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّكُمْ فِي زَمَانٍ عُلَمَاؤُهُ كَثِيرٌ وَخُطَبَاؤُهُ قَلِيلٌ مَنْ تَرَكَ فِيهِ عُشَيْرَ مَا يَعْلَمُ هَلَكَ وَسَيَأْتِي عَلَى النَّاسِ زَمَانٌ يَقِلُّ عُلَمَاؤُهُ وَيَكْثُرُ خُطَبَاؤُهُ مَنْ تَمَسَّكَ فِيهِ بِعُشَيْرِ مَا يَعْلَمُ نَجَا
21372 مسند أحمد بن حنبل