Ibn Jabir bin Atiq said: My father narrated to me a hadith that the Messenger of Allah, peace and blessings be upon him, said: "There is a kind of jealousy that Allah likes and a kind of jealousy that Allah dislikes. The jealousy that Allah likes is when a person is jealous in a situation of doubt (for example, if someone jokes or laughs with his wife in seclusion, he feels jealous), and the jealousy that Allah dislikes is when a person is jealous without any doubt (or evidence), without any reason (for example, if someone leaves his house and he, without investigation, kills him out of jealousy)."