وَإِن تُكَذِّبُوا فَقَدْ كَذَّبَ أُمَمٌ مِّن قَبْلِكُمْ وَمَا عَلَى الرَّسُولِ إِلَّا الْبَلَاغُ الْمُبِينُ

If you impugn [the Apostle’s teaching], then [other] nations have impugned [likewise] before you, and the Apostle’s duty is only to communicate in clear terms.