It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Do not curse one another with Allah’s curse, His wrath, and the Fire.

It is narrated from Sayyiduna Jarmoos Hijimi (may Allah be pleased with him), he says: I said: O Messenger of Allah! Advise me with something. The Prophet (peace and blessings be upon him) said: I advise you not to be one who curses.

Zaid bin Aslam says that Abdul Malik bin Marwan used to send a message to Sayyida Umm Darda (may Allah be pleased with her), so she would spend the night with his wives and he would ask her about the Prophet Muhammad (peace and blessings be upon him). One night Abdul Malik got up and called his maidservant. When she was late in coming, he cursed her. Upon this, Sayyida Umm Darda (may Allah be pleased with her) said: Do not curse, because Sayyiduna Abu Darda (may Allah be pleased with him) narrated to me that the Messenger of Allah (peace and blessings be upon him) said: Indeed, those who curse will not be witnesses nor intercessors on the Day of Resurrection.

It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: A believer is neither one who taunts, nor one who curses, nor one who uses obscene language, nor one who is foul-mouthed.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: It does not befit a truthful and honest person to be one who curses.

It is narrated from Abu Umair that he was a friend of Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him). One day, Sayyiduna Ibn Mas’ud (may Allah be pleased with him) came to visit him at his house, but he was not present at home. So he sought permission from his family and asked for a drink. His wife sent a maidservant to the neighbors to bring some drink. When she delayed and the wife cursed her, Sayyiduna Abdullah (may Allah be pleased with him) left. When Abu Umair came and said: O Abu Abdur Rahman! People like you cannot be suspected of anything improper. Why did you not greet your brother’s family, sit with them, and drink water, etc.? He said: I did exactly that, but the real matter is that your wife sent her maidservant, she delayed, perhaps the neighbors did not have that thing or, due to their own inclination, did not want to give it, so the maidservant was delayed, because of which your wife cursed her. And I heard the Messenger of Allah (peace and blessings be upon him) say: Verily, when something is cursed, if it finds a place for itself in that thing, then fine, otherwise it says: O my Lord! I have been sent towards so-and-so, but I do not see any place for myself in it. So it is said to it: Return to where you came from. So I feared that if the maidservant was excused, the curse would return and I would become its cause.

It is narrated from Sayyiduna Thabit bin Dhahak Ansari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Cursing a believer is equivalent to killing him.

It is also narrated from Sayyiduna Thabit bin Dhahhak Ansari, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: Whoever commits suicide with something, he will be punished with that very thing. Whoever bears witness of disbelief against a believer and a Muslim, it will be as if he has killed him. Whoever curses him, it will also be as if he has killed him. And whoever swears a false oath by any religion other than Islam, he will become as such.