Al Hadith- Sahih Bukhari
A person says something pleasing to Almighty Allah, which he doesn’t even pay attention to, but Almighty Allah raises that person’s status by several degrees And a person says something displeasing to Almighty Allah and doesn’t even care for it,but that person falls into hell because of it. (Sahih Bukhari, Babu Hifzul Lisaan, Hadith No. 6478)