Al-Mujadila 58:8 الم تر الى الذين نهوا عن النجوى ثم يعودون لما نهوا عنه ويتناجون بالاثم والعدوان ومعصيت الرسول واذا جاءوك حيوك بما لم يحيك به الله ويقولون في انفسهم لولا يعذبنا الله بما نقول حسبهم جهنم يصلونها فبيس المصير ٨

Have you not seen how those who have been forbidden to hold secret conversations go back afterwards and hold them, and conspire with one another in what is sinful, hostile, and disobedient to the Messenger? When they come to you they greet you with words God has never used to greet you, and say inwardly, ‘Why does God not punish us for what we say?’ Hell will be punishment enough for them: they will burn there- an evil destination.