حَدَّثَنَا يَزِيدُ أَنْبَأَنَا دَيْلَمُ بْنُ غَزْوَانَ الْعَبْدِيُّ حَدَّثَنَا مَيْمُونٌ الْكُرْدِيُّ عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ قَالَ إِنِّي لَجَالِسٌ تَحْتَ مِنْبَرِ عُمَرَ رَضِيَ اللَّهُ عَنْهُ وَهُوَ يَخْطُبُ النَّاسَ فَقَالَ فِي خُطْبَتِهِ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ إِنَّ أَخْوَفَ مَا أَخَافُ عَلَى هَذِهِ الْأُمَّةِ كُلُّ مُنَافِقٍ عَلِيمِ اللِّسَانِ
مسند امام احمد بن حنبل · Hadith 310
It was narrated that Abu 'Uthman an-Nahdi said: I was sitting beneath the minbar of 'Umar (RA) when he was addressing the people, and he said in his khutbalr. I heard the Messenger of Allah (PBUH) say: "What i fear the most for this ummah is every knowledgeable hypocrite with a smooth tongue."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020