جامع الترمذي #1987
Sahih (Authentic)
Good Character
مَا مِنْ شَيْءٍ أَثْقَلُ فِي مِيزَانِ الْمُؤْمِنِ يَوْمَ الْقِيَامَةِ مِنْ حُسْنِ الْخُلُقِ
The Messenger of Allah (ﷺ) said: 'Nothing will be heavier on the Day of Judgment in the scale of a believer than good character. Allah hates one who is obscene and shameless.'
سلسلة الرواة (الإسناد)
Narrated Abu Darda