সূরা ৫০ : আয়াত ৪৫

I know best what these deniers say. And you are not imposed on them, O Messenger, to force them to accept faith. You are only a conveyer of what Allah has ordered you to convey, so remind through the Qur’ān he who fears my warning to the disbelievers and the sinful, because the fearful is the one who takes advice and takes reminders when reminded.