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
suyuti:25171a –
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السيوطي:٢٥١٧١a –

"لا تَقْضِيَنَّ وَلا تَفْصِلَنَّ إِلا بِمَا تَعْلَمُ، وَإِنْ أشكَلَ عَلَيْكَ أمْرٌ فَقِفْ حَتَّى تَبيّنَه أوْ تَكْتُبَ إِلَىَّ فِيهِ".  

[هـ] ابن ماجة عن معاذ

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:55 – al-Ḥasan b. Ḥammād Sajjādah > Yaḥyá b. Saʿīd al-Amawī > Muḥammad b. Saʿīd b. Ḥassān > ʿUbādah b. Nusa > ʿAbd al-Raḥman b. Ghanm > Muʿādh b. Jabal

"When the Messenger of Allah ﷺ sent me to Yemen, he said: 'Do not pass any judgment or make any decision except on the basis of what you know. If you are uncertain about a matter, wait until you understand it fully, or write to me concerning it.'" (Maudu')  

ابن ماجة:٥٥ – حَدَّثَنَا الْحَسَنُ بْنُ حَمَّادٍ سَجَّادَةُ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ الأَمَوِيُّ عَنْ مُحَمَّدِ بْنِ سَعِيدِ بْنِ حَسَّانَ عَنْ عُبَادَةَ بْنِ نُسَىٍّ عَنْ عَبْدِ الرَّحْمَنِ بْنِ غَنْمٍ حَدَّثَنَا مُعَاذُ بْنُ جَبَلٍ قَالَ

لَمَّا بَعَثَنِي رَسُولُ اللَّهِ ﷺ إِلَى الْيَمَنِ قَالَ لاَ تَقْضِيَنَّ وَلاَ تَفْصِلَنَّ إِلاَّ بِمَا تَعْلَمُ فَإِنْ أَشْكَلَ عَلَيْكَ أَمْرٌ فَقِفْ حَتَّى تُبَيِّنَهُ أَوْ تَكْتُبَ إِلَىَّ فِيهِ