Riyad as-Salihin 1553
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 صلى الله عليه وسلم ‏:‏ ‏
"‏لا يكون اللعانون شفعاء، ولا شهداء يوم القيامة‏"‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏‏.‏