'Forewarn' in the Bible

Those who cling to their old sins, and indeed all of you, I have forewarned and still forewarn (as I did on my second visit when present, so I do now, though absent)

hard drinking, riotous feasting, and the like. And as to these I forewarn you, as I have already forewarned you, that those who are guilty of such things will have no share in the Kingdom of God.