"And We did not destroy any city except that it had warners" (Al-Shu'ara: 208), meaning: except after the proof, the messengers, and the excuse have been established.
﴿وَمَا أَهْلَكْنَا مِنْ قَرْيَةٍ إِلا لَهَا منذرون﴾ أَيْ: إِلَّا مِنْ بَعْدِ الْحُجَّةِ وَالرسل والإعذار