ʿUyūn akhbār al-Riḍā

Hadith 106
good-temper
106 - وَبِهذَا الإِسنادِ قالَ: قالَ عَلِىُّ بْنِ أَبِي طالِب‏ عَلَيْهِالسَّلامُ: حُسنُ الخُلقِ خَيْرُ قَرِينٍ.
31-106 According to the same documentation, Ali ibn Abi Talib (a.s.) said, “Being good-tempered is the best companion.”
Source: Shaykh Muḥammad b. ʿAlī al-Ṣaduq