Sayyiduna Bilal bin Harith (may Allah be pleased with him) reports that the Prophet (peace and blessings of Allah be upon him) said: “A man utters a word that pleases Allah, without giving it much importance, and he is recorded among those who please Allah until the Day of Resurrection. And a man utters a word that angers Allah, without giving it much importance, and he is recorded among those who incur Allah’s anger until the Day of Resurrection.”
Related hadith on this topic