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]. (FR)
App reference (FR): Book 18, Hadith 224 (FR)
Arabic/English book reference (FR): Book 18, Hadith 1734 (FR)