Muharamat - Prohibitions That Are Taken Too Lightly. Islamic book

Cursing a believer or someone who does not deserve to be cursed

Many people do not control their tongues at times of anger, and are quick to curse people, animals, inanimate objects, days, hours, etc. They may even curse themselves and their children, or a husband may curse his wife and vice versa. This is a very serious matter. Abu Zayd Thaabit ibn al-Dahhaak al-Ansari (may Allaah be pleased with him) reported that the Prophet (peace and blessings of Allaah be upon him) said: ". . . whoever curses a believer, it is as if he killed him." (Reported al-Bukhaari, see Fath al-Baari, 10/465). Because cursing is more common among women, the Prophet (peace and blessings of Allaah be upon him) explained that this would be one of the reasons for them entering Hell, and that those who curse will not be intercessors on the Day of Resurrection. More serious than that is the fact that the curse will come back on the one who utters it, if he says it unfairly; in that case he will have prayed against himself and excluded himself from the mercy of Allaah.