The idea of this research is based on tracing the implications of the use of speech by Sibawayh and studying the rulings he issued on silence and speech. Among the indications recorded by the research for the use of speech by Sibawayh: speaking - prose - meaning - structure - pronoun - Arab speech - source name for words - spoken words - analogy - words or expressions - judgment - what he speaks - a specific style of structures - specific words from the sentence - gender of the word - related sentences - writing - speaking - form - usage - pronunciation - verb. The rulings that he applied to speech are straightforwardness, referral, goodness, ugliness, dispensation, and completeness. As for the rulings of silence, they are permissibility and non-permissibility, goodness, ugliness, and dispensation. The research ended with the equality of expression in speech and silence in some places.