The Messenger of Allah ﷺ said, "Nothing is heavier on the scale than good character."
حدثنا محمد بن جعفر حدثنا شعبة قال سمعت القاسم بن أبي بزة عن عطاء الكيخاراني عن أم الدرداء
أن رسول الله ﷺ قال ما من شيء أثقل في الميزان من خلق حسن
Its isnad is sahih. Qasim bin Abu Bazza is the Makkan Quran reciter, and he is trustworthy, his hadith being found among the group of hadith scholars. Ata Khurasani is Ibn Nafi, and he is trustworthy, his hadith being found in the Sunan works. The hadith has already appeared at 27369.