The Source of Traditions on Imam al-Riḍā (Vol 2) · Hadith 41 (#Ḥadīth #41)

41 - وَبِهذَا الإِسنادِ قالَ: قالَ رَسُولُ اللَّهِ صَلَّى اللهُعَلَيْهِ وَآلِهِ: عَلَيْكُمْ بِحُسنِ الْخُلْقِ فَإِنَّ حُسنَ الخُلقِ الجَنَّةِ لا مَحالَةَ، وَإيّاكُم وَسُوءِ الْخُلْقِ، فَإِنَّ سُوءَ الْخُلْقِ فِي النَّارِ لا مَحالَةَ.

31-41 According to the same documentation, God’s Prophet (S) said, “I advise you to be good-tempered as undoubtedly a good-tempered person will go to Paradise. I admonish you against being bad-tempered, since a bad-tempered person will undoubtedly go to Hell.”

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).