لا يَرى أحَدُكُم إذا أدخَلَ على مُؤمِنٍ سُرورا أنَّه علَيهِ أدخَلَهُ فَقَطْ بَل وَ اللّهِ علَينا ، بل وَ اللّهِ عَلى رسولِ اللّهِ صلى الله عليه و آله.
Imam Ja‘far al-Ṣadiq (as):
When one of you brings joy to another believer, let him not see it as having only made him happy. Rather, by Allah, he makes us happy, and by Allah, he makes the Prophet (s) happy too.
Source:
al-Kāfī
Vol2
P189
ID: 16638