The Prophet ﷺ said, "A servant may speak a word that pleases Allah, giving it no thought, and Allah raises him by it many degrees. And a servant may speak a word that angers Allah, giving it no thought, and by it he plunges into Hell."
عن النبي ﷺ قال: إن العبد ليتكلم بالكلمة من رضوان الله لا يلقي لها بالا يرفعه الله بها درجات، وإن العبد ليتكلم بالكلمة من سخط الله لا يلقي لها بالا يهوي بها في جهنم.
Bukhari related it in the Book of Riqaq (6478), from Abdullah bin Munir, who heard Abu Nadr, who said, "Abdul-Rahman bin Abdullah, meaning Ibn Dinar, narrated to us, from his father, from Abu Salih, from Abu Hurairah," and he mentioned it.