(146) بَابُ اللِّعَانِ
Abu'd-Darda' reported that the Prophet, may Allah bless him andgrant him peace, said, "Those who curse will be neither witnesses nor intercessorson the Day of Rising."
Reference: Al-Adab Al-Mufrad 316
In-book reference: Book 15, Hadith 8
English translation: Book 15, Hadith 316