Kitāb al-Muʾmin

Hadith 114
brotherhoodparadise
وعن أبي جعفر عليه السلام قال: قال رسول الله صلى الله عليه و آله وسلم: من سر مؤمنا فقد سرني، ومن سرني فقد سر الله.
114. It has been reported that Abu Ja'far (a.s) said that the Messenger of Allah (a.s) said:One who makes a believer happy has in fact made me happy; and one who makes me happy has in fact made Allah happy.
Source: Ḥusayn b. Saʿīd al-Ahwāzī