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:15645a –
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السيوطي:١٥٦٤٥a –

"عَلَيكَ بحسنِ الْخُلُقِ، فإِنَّ أَحْسَنَ النَّاسِ خُلُقًا أَحْسَنُهُمْ دينًا".  

[طب] الطبرانى في الكبير عن معاذ

See similar narrations below:

Collected by Ṭabarānī
tabarani:17493 – Muḥammad b. Ibrāhīm al-ʿAssāl al-Aṣbahānī > Ismāʿīl b. ʿAmr al-Bajalī > Abū Maryam ʿAbd al-Ghaffār b. al-Qāsim > Ḥabīb b. Abū Thābit > Maymūn b. Abū Shabīb > Muʿādh b. Jabal

[Machine] The Messenger of Allah ﷺ sent me to Yemen, so I said, "O Messenger of Allah, advise me." He said, "You must have good character, for indeed the best of people with regard to character are the best of them in religion."  

الطبراني:١٧٤٩٣ – حَدَّثَنَا مُحَمَّدُ بْنُ إِبْرَاهِيمَ الْعَسَّالِ الْأَصْبَهَانِيُّ ثنا إِسْمَاعِيلُ بْنُ عَمْرٍو الْبَجَلِيُّ ثنا أَبُو مَرْيَمَ عَبْدُ الْغَفَّارِ بْنُ الْقَاسِمِ عَنْ حَبِيبِ بْنِ أَبِي ثَابِتٍ عَنْ مَيْمُونِ بْنِ أَبِي شَبِيبٍ عَنْ مُعَاذِ بْنِ جَبَلٍ قَالَ

بَعَثَنِي رَسُولُ اللهِ ﷺ إِلَى الْيَمَنِ فَقُلْتُ يَا رَسُولَ اللهِ أَوْصِنِي فَقَالَ «عَلَيْكَ بِحُسْنِ الْخُلُقِ فَإِنَّ أَحْسَنَ النَّاسِ خُلُقًا أَحْسَنُهُمْ دِينًا»