Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said: "It does not befit a Siddiq (righteous Muslim) to frequently curse others."[Muslim] (PT)
App reference (PT): Book 18, Hadith 42 (PT)
Arabic/English book reference (PT): Book 18, Hadith 1552 (PT)