The Book of the Believer · Hadith 119 (#Ḥadīth #13)
Chapter 5 | The Reward of Helping a Believer, Relieving Him of Distress And Showing Him Kindness
119 - وعن أبي عبد الله عليه السلام قال: أيما مؤمن سأله أخوه المؤمن حاجته وهو يقدر على قضائها فرده منها سلط الله عليه شجاعا 7 في قبره ينهش من أصابعه.
119. It has been reported that Abu 'Abd Allah said: If any believer asks his fellow brother to help him and he refuses while he is able to do, Allah will impose on him a serpent in his grave to bite his fingers.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).