'Away' in the Bible

Give no belief to false words: because there will first be a falling away from the faith, and the revelation of the man of sin, the son of destruction,

Now we give you orders, brothers, in the name of our Lord Jesus Christ, to keep away from all those whose behaviour is not well ordered and in harmony with the teaching which they had from us.

And if any man does not give attention to what we have said in this letter, take note of that man, and keep away from him, so that he may be shamed.