A curse returning to the curser if the cursed does not deserve it

A: A true believer whose faith is complete does not curse others. In Musnad and Al-Jame`, Imam Ahmad and Al-Tirmidhy respectively related on the authority of `Alqamah from `Abdullah (Part No. 26; Page No. 67) ibn Mas`ud (may Allah be pleased with him) that the Prophet (peace be upon him) stated: The believer is not a slanderer, or a curser, or one who indulges in obscenity, or engages in foul talk. (Al-Tirmidhy classified it as a good Hadith Gharib (a Hadith with a single narrator usually at the beginning of the chain of narration)). It was authentically established in the two Sahihs (authentic books) on the authority of Thabit ibn Al-Dahhak from the Prophet (peace be upon him) that he said: Cursing a believer is like killing him. Thus, it is impermissible for believers to curse any Muslim except one who is cursed by Allah in His Book, or by the Prophet (peace be upon him). One should not curse the sinner, such as the unveiled woman, because of her sin. Muslims should, rather advise and urge her kindly to observe Hijab. One who curses another who does not deserve the curse is strongly warned that the curse returns to him/her if it is unjustified. This is affirmed by the report narrated by Abu Al-Darda' (may Allah be pleased with him) that the Prophet (peace be upon him) said: When a person curses somebody or something, the curse goes up to heaven and the gates of heaven get closed. Then it comes down to the earth and its gates get closed. Then it turns right and left, and if it does not find an entrance to go anywhere, it returns to the person or thing that was cursed; if he or it deserves to be cursed; otherwise it returns to the person who uttered it. (Related by Imam Ahmad in his Musnad and Abu Dawud in his Sunan). May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!