What does Islam teach about controlling the tongue?

The tongue is described in Islamic teaching as one of the smallest but most dangerous parts of the body, capable of causing harm far beyond a person's fists. The Quran reminds believers that every word is recorded: "Not a word does he utter except that with him is an observer prepared [to record it]" (50:18). The Prophet tied speech directly to the strength of one's faith, saying, "Whoever believes in Allah and the Last Day should speak what is good or remain silent" (Sahih al-Bukhari 6136) — making silence itself a form of righteous restraint when there is nothing beneficial to say. Controlling the tongue covers far more than avoiding obscenity; it includes not mocking others, not spreading rumors, avoiding exaggeration and empty promises, and pausing before speaking in anger. Many scholars note that the majority of sins people commit involve the tongue — lying, backbiting, cursing, insulting — precisely because speech is so easy and instantaneous compared to physical action. A believer is encouraged to consider before speaking whether the words are true, necessary, and kind, recognizing that a moment's careless remark can cause damage that takes years to repair.

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