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] (DE)
App reference (DE): Book 18, Hadith 42 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1552 (DE)