Surah Al-Mujadilah, ayah 10

58:10

إِنَّمَا ٱلنَّجۡوَىٰ مِنَ ٱلشَّيۡطَٰنِ لِيَحۡزُنَ ٱلَّذِينَ ءَامَنُواْ وَلَيۡسَ بِضَآرِّهِمۡ شَيۡـًٔا إِلَّا بِإِذۡنِ ٱللَّهِۚ وَعَلَى ٱللَّهِ فَلۡيَتَوَكَّلِ ٱلۡمُؤۡمِنُونَ ١٠

Innaman-najwā minash-shaytāni liyahzunal-ladhīna āmanū walaysa bidārrihim shay'an illā bi idhnillāhi wa'alallāhi falyatawakkalil-mu'minūn

Private conversation is only from Satan that he may grieve those who have believed,1644 but he will not harm them at all except by permission of Allāh. And upon Allāh let the believers rely.

Footnotes

1644 The reference may be to the sinful type of conversation, as mentioned in the previous verses, or to the practice of two persons speaking in confidence in the presence of a third, which might lead him to assume that he is the subject of their conversation. Such behavior was prohibited by the Prophet (ﷺ) in narrations of al-Bukhārī and Muslim.