A'isha reported that two persons visited Allah's Messenger (s.a.w.a.) and both of them talked about a thing, of which I am not aware, but that annoyed him and he invoked curse upon both of them and hurled malediction at them, and when they went out I said:

O Allah's Messenger (s.a.w.a.), the good would reach everyone but it would not reach these two. He said: Why so? I said: Because you have invoked curse and hurled malediction upon both of them. He said: Don't you know that I have made condition with my Lord saying thus: O Allah, I am a human being and that for a Muslim upon whom I invoke curse or hurl malediction make it a source of charity and reward.

This hadith has been reported on the authority of A'mash with the same chain of transmitters and the hadith transmitted on the authority of 'Isa (the words are):

"He had a private meeting with them and hurled malediction upon them and cursed them and sent them out."

Abu Huraira reported Allah's Messenger (s.a.w.a.) as saying:

O Allah, I am a human being and for any person amongst Muslims upon whom I hurl malediction or invoke curse or give him whipping make it a source of purity and mercy.

It was narrated from Anas:

"The Messenger of Allah (s.a.w.a.) said the Qunut for a month."- (One of the narrators) Shu'bah said: "He cursed some men." Hisham said: "He supplicated against some of the tribes of Arabs. Then he stopped doing that after bowing." This is what Hisham said. Shu'bah said, narrating from Qatadah, from Anas that the Prophet (S) said the Qunut for a month, cursing Ri'l, Dhakwaan and Lihyaan.