The Letter Qaf - 50:28
"He says, "Do not quarrel in My presence. I have already sent you a warning."
A warner has been sent to every people:
Prophet Jonah/10:47
For every community there is a messenger. When their messenger comes, they will be judged with justice and they will not be wronged.
The Thunder/13:7
"The disbelievers say, "Should not a miracle have come down to him? You are but a warner. For every people there is a Guidance."
Originator/35:24
We have sent you with the truth as a bearer of glad tidings and a warner, and in every community there has come a warner.
The Night Journey/17:15
Whoever is guided is guided for himself. Whoever goes astray goes astray to his own detriment. No one bears the burden of another. We do not punish anyone without sending a messenger
The Stories/28:59
Your Lord does not destroy a people until He sends to their center a messenger who recites to them Our Verses. And We never destroy a people whose people are not oppressors.
The Bee/16:36
"And We sent a messenger among every people, saying, "Serve Allah and beware of idolatry."Some of them were guided by Allah, and some of them were condemned to remain in error. Travel through the earth and see how was the end of those who denied."
The Poets/26:208
We did not destroy any city without a warner.