Abu Hurairah (May Allah be pleased with him) reported:
The Prophet (ﷺ) said, "A man utters a word pleasing to Allah without considering it of any significance for which Allah exalts his ranks (in Jannah); another one speaks a word displeasing to Allah without considering it of any importance, and for this reason he will sink down into Hell."[Al-Bukhari].
App reference: Book 18, Hadith 5
Arabic/English book reference: Book 18, Hadith 1515