Abud-Darda' (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "Those who frequently resort to cursing (people) would neither be accepted as witnesses nor as intercessors on the Day of Resurrection."[Muslim]. (JA)
App reference (JA): Book 18, Hadith 43 (JA)
Arabic/English book reference (JA): Book 18, Hadith 1553 (JA)