مَن فَرَّجَ عَن مُؤِمنٍ فَرَّجَ اللّهُ عَن قَلبِهِ یومَ القیامَةِ.

He who relieves the sorrow of believers and solves their problems, God will remove the sorrow from his heart on the Day of Judgment.

Asul Kafi, vol. 2, p. 200