Yunus 10:19

Wama kana annasuilla ommatan wahidatan fakhtalafoo walawlakalimatun sabaqat min rabbika laqudiya baynahum feemafeehi yakhtalifoon

And mankind was not but one community [united in religion], but [then] they differed. And if not for a word that preceded from your Lord, it would have been judged between them [immediately] concerning that over which they differ.

All the people were no more than a single community; later, they differed. But for a word from your Lord that had already come to pass, a decisive judgment would have been made about their mutual differences.