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:506a –
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السيوطي:٥٠٦a –

("أثقلُ ما يوضَعُ في الميزانِ: الخلقُ الحَسَنُ".  

[د] أبو داود [ت] الترمذي عن أبي الدرداء

See similar narrations below:

Collected by Ibn Ḥibbān, Suyūṭī

ذِكْرُ الْبَيَانِ بِأَنَّ الْخُلُقَ الْحَسَنَ مِنْ أَثْقَلِ مَا يَجِدُ الْمَرْءُ فِي مِيزَانِهِ يَوْمَ الْقِيَامَةِ

ibnhibban:481 – Abū Khalīfah > Muḥammad b. Kathīr And Shuʿayb b. Muḥriz Wa-al-Ḥawḍī > Shuʿbah > al-Qāsim b. Abū Bazzah > ʿAṭāʾ al-Kaykhārānī > Um al-Dardāʾ > Abū al-Dardāʾ

[Machine] The Prophet ﷺ said, "The heaviest thing in the scale is good character."  

ابن حبّان:٤٨١ – أَخْبَرَنَا أَبُو خَلِيفَةَ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ كَثِيرٍ وَشُعَيْبُ بْنُ مُحْرِزٍ وَالْحَوْضِيُّ قَالُوا حَدَّثَنَا شُعْبَةُ عَنِ الْقَاسِمِ بْنِ أَبِي بَزَّةَ عَنْ عَطَاءٍ الْكَيْخَارَانِيِّ عَنْ أُمِّ الدَّرْدَاءِ عَنْ أَبِي الدَّرْدَاءِ

عَنِ النَّبِيِّ ﷺ قَالَ «أَثْقَلُ شَيْءٍ فِي الْمِيزَانِ الْخُلُقُ الْحَسَنُ»