It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Sometimes a person utters a word, considering there is no harm in it, but as a result of that single word, on the Day of Judgment, he will keep tumbling in Hell for seventy years.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10895
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 6478، وهذا إسناد منقطع، الحسن لم يسمع من أبى هريرة