Kitāb al-Muʾmin
Hadith 178178 - وعن أبي عبد الله عليه السلام قال: ما من مؤمن يخذل أخاه وهو يقدر على نصرته، إلا خذله الله عز وجل في الدنيا والآخرة.
178. It has been reported that Abu 'Abd Allah (a.s) said: Any believer that disappoints his brother while he is able to help him, Allah will desert him in the world and the hereafter.