Hazrat Abu Hurairah (may Allah be pleased with him) heard the Messenger of Allah say that a servant utters a word without thinking about it (how much disbelief and disrespect it contains), because of which he falls into the pit of Hell as far as the distance between the east and the west.
Hadith Referenceاللؤلؤ والمرجان / كتاب الزهد والرقائق / 1881
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 81 كتاب الرقاق: 23 باب حفظ اللسان»