كتاب الأمور المنهي عنها
18
The Book of the Prohibited actions
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)‏‏)‏‏.‏
Sunnah.com reference : Book 18, Hadith 43
Arabic/English book reference : Book 18, Hadith 1553