Riyad as-Salihin, Book 18, Hadith 1553 (In-Book) ⓘ
Abud-Darda' (May Allah be pleased with him) said: The Messenger of Allah 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 صلى الله عليه وسلم : "لا يكون اللعانون شفعاء، ولا شهداء يوم القيامة" ((رواه مسلم)).