'Warn' in the Bible

And He would strongly warn them not to make Him known.

because I have five brothers—to warn them, so they won’t also come to this place of torment.’

I’m not writing this to shame you, but to warn you as my dear children.

And we exhort you, brothers: warn those who are irresponsible, comfort the discouraged, help the weak, be patient with everyone.

Yet don’t treat him as an enemy, but warn him as a brother.