A person may utter a word pleasing to Allah, the Almighty, without considering it of any significance, and because of it Allah raises his ranks; and a person may utter a word displeasing to Allah, the Almighty, without considering it of any significance, and because of it he sinks down into Hellfire.[Al-Bukhari]

«إن العبد لَيَتَكَلَّمُ بالكلمة من رِضْوَانِ الله تعالى ما يُلْقِي لها بَالًا يَرْفَعُهُ الله بها درجاتٍ، وإن العبد لَيَتَكَلَّمُ بالكلمة من سَخَطِ الله تعالى لا يُلْقِي لها بَالًا يَهْوِي بها في جهنم» (البخاري)