"Indeed Allah, Most High, said:'I have created creatures whose tongues are sweeter than honey and their hearts are more bitter than aloes. So by Me, I swear to abase them with a Fitnah, leaving them utterly devoid of reason. Is it Me whom they try to delude, or it is against Me whom they conspire?'" (Using translation from Tirmidhī 2405)
"إِنَّ الله تَعَالى قَال: لَقَدْ خَلَقْت خَلقًا أَلْسِنتُهُمْ أحْلَى مِنَ الْعَسَل، وَقُلوبُهُم أمَرُّ مِنَ الصَّبْرِ، فَبِي حَلَفْتُ: لأُتيحنَّهُم فِتْنَة تَدَع الْحَليمَ مْنُهمْ حَيرانَ، فَبِي يَغْتَرُّونَ، أمْ عَليَّ يَجْتَرِئُونَ؟ ! ".