(23) باب حِفْظِ اللِّسَانِ
Narrated Abu Huraira:
That he heard Allah's Messenger (ﷺ) saying, "A slave of Allah may utter a word without thinking whether it is right or wrong, he may slip down in the Fire as far away a distance equal to that between the east."
Reference: Sahih al-Bukhari 6477
In-book reference: Book 81, Hadith 66
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 76, Hadith 484