The Sufficient (Vol 2) · Hadith 691 (#Ḥadīth #15)
Chapter 82 | To Please the Believers
15ـ عَنْهُ عَنْ إِسْمَاعِيلَ بْنِ مَنْصُورٍ عَنِ الْمُفَضَّلِ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ أَيُّمَا مُسْلِمٍ لَقِيَ مُسْلِماً فَسَرَّهُ سَرَّهُ الله عَزَّ وَجَلَّ.
15. It is narrated from him (narrator of the Hadith above) from Isma’il ibn Mansur from al-Mufaddal from Abu ‘Abdillah who has said the following: “Any Muslim who, on his meeting another Muslim, sends joy to his heart, Allah, the Most Majestic, the Most Holy, sends joy to his (initiator of joy) heart.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).