Mishkat al-Masabih #253
Knowledge
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن زِيَاد بن حدير قَالَ: قَالَ لِي عُمَرُ: هَلْ تَعْرِفُ مَا يَهْدِمُ الْإِسْلَامَ؟ قَالَ: قُلْتُ: لَا. قَالَ: يَهْدِمُهُ زَلَّةُ الْعَالِمِ وَجِدَالُ الْمُنَافِقِ بِالْكِتَابِ وَحُكْمُ الْأَئِمَّةِ المضلين ". رَوَاهُ الدِّرَامِي
Ziyad b. Hudair said that ‘Umar asked him whether he knew what
demolishes Islam, and that when he replied that he did not, he said,
"The slip of a learned man, the disputation of a hypocrite about the
Book, and the rule of imams who lead men astray.” Darimi transmitted
it.
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About Mishkat al-Masabih
This hadith is #253 from Mishkat al-Masabih, in the Book of Knowledge.