Kitāb al-Muʾmin
Hadith 9696 - وعن أبي عبد الله (ع) قال المؤمنُ أخو المؤمن يحِقُّ عليه نصيحتُه ومواساتُه ومَنعُ عدوِّه منه.
96. It has been reported that Abu 'Abd Allah (a.s) said: A believer is a brother to another believer and it is his right that he should counsel him, sympathize with him and prevent his enemies from harming him.