Abu ad-Darda’ (RAA) narrated that the Messenger of Allah (ﷺ) said:

“The heaviest thing which will be put on the believer’s scale (on the Day of Resurrection) will be good morals.” Related by Abu Dawud and At-Tirmidhi who graded it as Sahih.

وَعَنْ أَبِي اَلدَّرْدَاءِ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ مَا مِنْ شَيْءٍ فِي اَلْمِيزَانِ أَثْقَلُ مِنْ حُسْنِ اَلْخُلُقِ } أَخْرَجَهُ أَبُو دَاوُدَ, وَاَلتِّرْمِذِيُّ وَصَحَّحَهُ .‏ [1]‏ .‏