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].

وعن أبي الدرداء رضي الله عنه قال: قال رسول الله ﷺ : "لا يكون اللعانون شفعاء، ولا شهداء يوم القيامة" ((رواه مسلم)).