The Prophet; said, "A slave (of Allah) may utter a word which pleases Allah without giving it much importance, and because of that Allah will raise him to degrees (of reward): a slave (of Allah) may utter a word (carelessly) which displeases Allah without thinking of its gravity and because of that he will be thrown into the Hell-Fire."
Reference: Sahih al-Bukhari 6478 In-book : Book 81, Hadith 67 USC-MSA web (English) : Vol. 8, Book 76, Hadith 485 (deprecated)
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