Hadith # 1515
Abu Hurairah (May Allah be pleased with him) reported: The Prophet (PBUH) 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]
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