Sa'd reported God’s messenger as saying, “No one will act deceitfully towards the inhabitants of Medina without being dissolved as salt is dissolved in water.” Bukhari and Muslim.

وَعَنْ سَعْدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا يَكِيدُ أَهْلَ الْمَدِينَةِ أَحَدٌ إِلَّا انْمَاعَ كَمَا يَنْمَاعُ الْملح فِي المَاء»