He who obeys the Messenger has obeyed Allah; but those who turn away - We have not sent you over them as a guardian.  

مَنْ يُطِعِ الرَّسُولَ فَقَدْ أَطَاعَ اللَّهَ ۖ وَمَنْ تَوَلَّىٰ فَمَا أَرْسَلْنَاكَ عَلَيْهِمْ حَفِيظًا  

And they say, "˹We pledge˺ obedience." But when they leave you, a group of them spend the night determining to do other than what you say. But Allah records what they plan by night. So leave them alone and rely upon Allah. And sufficient is Allah as Disposer of affairs.  

وَيَقُولُونَ طَاعَةٌ فَإِذَا بَرَزُوا مِنْ عِنْدِكَ بَيَّتَ طَائِفَةٌ مِنْهُمْ غَيْرَ الَّذِي تَقُولُ ۖ وَاللَّهُ يَكْتُبُ مَا يُبَيِّتُونَ ۖ فَأَعْرِضْ عَنْهُمْ وَتَوَكَّلْ عَلَى اللَّهِ ۚ وَكَفَىٰ بِاللَّهِ وَكِيلًا