The Book of the Believer · Hadith 131 (#Ḥadīth #25)
Chapter 5 | The Reward of Helping a Believer, Relieving Him of Distress And Showing Him Kindness
131- وعن أبي عبد الله عليه السلام قال: إن مما يحب الله من الأعمال، إدخال السرور على المسلم
131. It has been reported that Abu 'Abd Allah said: Indeed, of the actions loved by Allah is bringing happiness to a Muslim.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).