Ibn Umar, may Allah be pleased with him, narrates that the Messenger of Allah, peace and blessings be upon him, said: "A believer is not one who curses." In another narration: "It is not appropriate for a believer to be one who curses." Its chain is good; narrated by al-Tirmidhi.
Hadith Referenceمشكوة المصابيح / كتاب الآداب / 4848
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:إسناده حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده حسن، رواه الترمذي (2019)»