Ibn Mas'ud (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "A true believer does not taunt or curse or abuse or talk indecently."[At-Tirmidhi]. (DE)
App reference (DE): Book 18, Hadith 224 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1734 (DE)