The Book of the Believer · Hadith 143 (#Ḥadīth #37)
Chapter 5 | The Reward of Helping a Believer, Relieving Him of Distress And Showing Him Kindness
143- وعن أبي عبد الله عليه السلام قال: أوحى الله عز وجل إلى داود (ع): إن العبد من عبادي ليأتيني بالحسنة فأبيحه جنتي، فقال داود، يا رب وما تلك الحسنة؟ قال: يدخل على عبدي المؤمن سرورا ولو بتمرة، قال داود: حق لمن عرفك أن لا يقطع رجاءه منك
143. It has been reported that Abu 'Abd Allah said: Allah [M.G] revealed to Dawud (Prophet David saying: 'Sometimes, My servant brings Me one good deed and I make Paradise lawful for him.' Dawud asked, 'O Lord: what is that good deed?' 'It is bringing happiness to My believing servant,' he said, 'even if it be with a single piece of date.' 'O Lord,' responded Dawud, 'One who knows You will never lose hope in You.'
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).