Sayyiduna Bilal bin al-Harith (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "A man speaks a word that angers Allah, not even imagining how far it will reach, and His displeasure is written for him until the Day of Resurrection. And a man speaks a word that pleases Allah, not even imagining how far it will reach, and His pleasure is written for him until the day he meets Him."
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1125