Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
darimi:220 – Muḥammad b. ʿUyaynah > ʿAlī > Ibn Mushir > Abū Isḥāq > al-Shaʿbī > Ziyād b. Ḥudayr > Qāl Lī ʿUmar Hal Taʿrif Mā Yahdim al-Islām > Qult Lā

[Machine] For me, Omar said: "Do you know what destroys Islam?" I said, "No." He said, "It is destroyed by the slip of a knowledgeable person, the arguments of a hypocrite with the Book, and the judgments of misguided leaders."  

الدارمي:٢٢٠ – أَخْبَرَنَا مُحَمَّدُ بْنُ عُيَيْنَةَ أَنبَأَنَا عَلِيٌّ هُوَ ابْنُ مُسْهِرٍ عَنْ أَبِي إِسْحَاقَ عَنِ الشَّعْبِيِّ عَنْ زِيَادِ بْنِ حُدَيْرٍ قَالَ قَالَ

لِي عُمَرُ «هَلْ تَعْرِفُ مَا يَهْدِمُ الْإِسْلَامَ؟» قَالَ قُلْتُ لَا قَالَ «يَهْدِمُهُ زَلَّةُ الْعَالِمِ وَجِدَالُ الْمُنَافِقِ بِالْكِتَابِ وَحُكْمُ الْأَئِمَّةِ الْمُضِلِّينَ»  

See similar narrations below:

Collected by Suyūṭī
suyuti:2-176b – Ziyād b. Ḥudrah > Qāl ʿUmar b. al-Khaṭṭāb Hal Taʿrif Mā Yahdim al-Islām Qult Lā
Request/Fix translation

  

السيوطي:٢-١٧٦b –

"عَنْ زِيَادِ بْنِ حُدْرَةَ قَالَ: قَالَ عُمَرُ بْنُ الخَطَّابِ: هَلْ تَعْرِفُ مَا يَهدِمُ الإِسْلَامَ؟ قُلْتُ: لَا، قَالَ: يَهْدِمُهُ زَلَّةُ العَالِم، وَجِدَالُ الْمُنافِقِ بِالكِتَابِ، وَحُكْمُ الأَئِمَّةِ المُضِلَّين".  

الدارمى