وَإِنْ تُكَذِّبُوا فَقَدْ كَذَّبَ أُمَمٌ مِنْ قَبْلِكُمْ ۖ وَمَا عَلَى الرَّسُولِ إِلَّا الْبَلَاغُ الْمُبِينُ 18
"And if ye reject (the Message), so did generations before you: and the duty of the messenger is only to preach publicly (and clearly)."