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.

It is narrated from Abu Hassan that when Sayyiduna Ali (may Allah be pleased with him) would give an order and, after its completion, it was said to him that such and such task had been accomplished, he would say: "Allah and His Messenger have spoken the truth." Ashtar said to him: "This statement of yours has become well-known among the people. Did the Messenger of Allah (peace and blessings be upon him) give you any special advice regarding this?" Sayyiduna Ali (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him) did not give me any special advice that he did not give to other people, except for what I heard from him and which is in the scroll present in the sheath of my sword." Upon hearing this, the people began to insist, until he took out the scroll. In it was written: "Whoever invents a bid'ah (innovation), or gives shelter to an innovator, upon him is the curse of Allah, the angels, and all people, and neither his obligatory nor his voluntary worship will be accepted." In it was also this hadith: "Indeed, Ibrahim (peace be upon him) declared Makkah to be sacred..."

It is narrated from Abu Tufail, he says: We said to Sayyiduna Ali (may Allah be pleased with him): Tell us about something which the Messenger of Allah (peace and blessings be upon him) granted only to you. He said: The Prophet (peace and blessings be upon him) did not tell me any secret which he concealed from the people, except that I heard him say: May Allah curse the one who sacrifices for other than Allah; may Allah curse the one who gives shelter to an innovator; may Allah curse the one who curses his parents; and may Allah curse the one who changes the landmarks of the earth.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: The wrath of Allah becomes severe upon the person whom the Messenger of Allah kills in the way of Allah.

It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the wife of Walid bin Uqbah came to the Noble Prophet (peace and blessings be upon him) and said: O Messenger of Allah! My husband Walid beats me, thus she complained about her husband. The Prophet (peace and blessings be upon him) said: Tell him that the Messenger of Allah has given me protection. After staying for a few days, she came again and said: He has only increased in beating me. The Prophet (peace and blessings be upon him) took the edge of his garment, gave it to her, and said: Tell him that the Messenger of Allah has given me protection. After a short while, she came again and said: He has only increased in beating me. Upon hearing this, the Prophet (peace and blessings be upon him) raised both his hands and said: O Allah! Seize Walid, he has become sinful twice because of me.

It is narrated from Sayyiduna Abdullah bin Abbas, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: Cursed is the one who abuses his father, cursed is the one who speaks ill of his mother, cursed is the one who sacrifices for other than Allah, cursed is the one who changes the landmarks of the earth, cursed is the one who misleads a blind person from the path, cursed is the one who commits indecency with an animal, and cursed is the one who commits the act of the people of Lot.

It is narrated from Sayyiduna Abu Barzah (may Allah be pleased with him), he says: We were on a journey with the Messenger of Allah (peace and blessings be upon him), and he heard two individuals singing, responding to each other. One of them said: The bones of my helpers remained visible (because they were not buried), he refrained from removing the battle from himself until he was hidden and buried under the earth. The Noble Prophet (peace and blessings be upon him) said: See, who are these? The people said: These are so-and-so and so-and-so. He (peace and blessings be upon him) said: O Allah! Make the hair of their heads fall out and reject them into Hell.