Kitāb al-Muʾmin #114Messenger 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...
Al-Kāfi #677“I heard abu Ja’far (a.s.) saying, ‘The messenger of Allah has said, “Whoever pleases a believer has pleased me, and whoever, pleases me has...