Mishkat al-Masabih #229
Knowledge
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي الدَّرْدَاءِ قَالَ: كُنَّا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَشَخَصَ بِبَصَرِهِ إِلَى السَّمَاءِ ثُمَّ قَالَ: «هَذَا أَوَانٌ يُخْتَلَسُ فِيهِ الْعِلْمُ مِنَ النَّاسِ حَتَّى لَا يَقْدِرُوا مِنْهُ على شَيْء» . رَوَاهُ التِّرْمِذِيّ
Abu Darda’ told how God’s messenger, on an occasion when they
were with him, turned his eyes to the sky and said, "This is a time when
knowledge will be snatched away from men, so that they will be unable
to acquire any.” Tirmidhi transmitted it.
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About Mishkat al-Masabih
This hadith is #229 from Mishkat al-Masabih, in the Book of Knowledge.