Thawāb al-Aʿmāl wa ʿiqāb al-Aʿmāl

Hadith 765
mourning-condolenceparadise
وَ عَنْهُ ص قَالَ: مَنْ عَزَّی حَزِیناً کُسِیَ فِی الْمَوْقِفِ حُلَّهً یُجْبَرُ بِهَا.
2. The Holy Prophet (s.a.w.s.) said, “One who says words of condolence to a sad person, will be awarded a fine dress to be worn on the Day of Judgment.”
Source: Shaykh Muḥammad b. ʿAlī al-Ṣaduq