Kitāb al-Muʾmin

Hadith 179
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179 - وعن أبي عبد الله عليه السلام قال: أيما مؤمن سأل أخاه المؤمن حاجة، وهو يقدر على قضائها، فرده بها، سلط الله عليه شجاعا في قبره ينهش أصابعه.
179. It has been reported that Abu 'Abd Allah (a.s) said: If any believer asks a fellow believer for help but the other refuses though he is able to do, Allah will impose a serpent in his grave biting his fingers.
Source: Ḥusayn b. Saʿīd al-Ahwāzī