Al-An'am 6:66

Wakaththaba bihi qawmuka wahuwa alhaqququl lastu AAalaykum biwakeel

But your people have denied it while it is the truth. Say, "I am not over you a manager [i.e., authority]."

Your people have rejected it (the Qur’ān) while it is the whole truth. Say, “I am not appointed as a taskmaster over you.