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:6248a –
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السيوطي:٦٢٤٨a –

"إِنَّ أَفضَل ما يُوضَعُ في الميزان يوم القيامةِ الْخُلُقُ الْحسنُ".  

[طب] الطبرانى في الكبير عن أُمِّ الدَّرْداءِ

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī

خَيْرَةُ بِنْتُ أَبِي حَدْرَدٍ أُمُّ الدَّرْدَاءِ وَيُقَالُ لَهَا هُجَيْمَةُ

tabarani:21119 – Aḥmad b. ʿAmr al-Khallāl al-Makkī > Yaʿqūb b. Ḥumayd > Marwān b. Muʿāwiyah > Ismāʿīl b. Muslim > ʿAṭāʾ al-Kaykhārānī > ʿAbdullāh b. Bābāh > Um al-Dardāʾ

[Machine] I heard the Messenger of Allah ﷺ say, "Indeed, the best thing that will be placed on the Scale on the Day of Judgment is good character."  

الطبراني:٢١١١٩ – حَدَّثَنَا أَحْمَدُ بْنُ عَمْرٍو الْخَلَّالُ الْمَكِّيُّ ثنا يَعْقُوبُ بْنُ حُمَيْدٍ ثنا مَرْوَانُ بْنُ مُعَاوِيَةَ عَنْ إِسْمَاعِيلَ بْنِ مُسْلِمٍ عَنْ عَطَاءٍ الْكَيْخَارَانِيِّ عَنْ عَبْدِ اللهِ بْنِ بَابَاهِ عَنْ أُمِّ الدَّرْدَاءِ قَالَتْ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «إِنَّ أَفْضَلَ مَا يُوضَعُ فِي الْمِيزَانِ يَوْمَ الْقِيَامَةِ الْخُلُقُ الْحَسَنُ»