Surah Al-Isra — Ayah 53 (17:53)
وَقُل لِّعِبَادِي يَقُولُواْ ٱلَّتِي هِيَ أَحۡسَنُۚ إِنَّ ٱلشَّيۡطَٰنَ يَنزَغُ بَيۡنَهُمۡۚ إِنَّ ٱلشَّيۡطَٰنَ كَانَ لِلۡإِنسَٰنِ عَدُوّٗا مُّبِينٗا ٥٣
English translation (Saheeh International)
And tell My servants to say that which is best. Indeed, Satan induces [dissension] among them. Indeed Satan is ever, to mankind, a clear enemy.
Brief commentary
Say, O Messenger, to my believing servants: that they should say good words when speaking and refrain from bad off-putting words, because the satan exploits them to spread between them what will spoil their worldly life and their Hearafter. Surely, the satan is an open enemy, so it is necessary to be wary of him.