Sahih Muslim Book 45, Hadith 110

I heard Allah's Messenger (ﷺ) as saying: The invoker of curse would neither be witness nor intercessor on the Day of Resurrection.

Previous Hadith

This hadith has been narrated on the authority of Zaid b. Aslam with the same chain of transmitters.

Sahih Muslim Book 45, Hadith 109
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Invoke curse upon the polytheists, whereupon he said: I have not been sent as the invoker of curse, but I have been sent as mercy."

Sahih Muslim Book 45, Hadith 111