'Warning' in the Bible

Therefore be on the alert, remembering that night and day for three years I did not stop warning each one of you with tears.

Now these things happened to them as examples, and they were written as a warning to us, on whom the ends of the ages have come.

I gave a warning when I was present the second time, and now I give a warning while I am absent to those who sinned before and to all the rest: If I come again, I will not be lenient,

We proclaim Him, warning and teaching everyone with all wisdom, so that we may present everyone mature in Christ.

Reject a divisive person after a first and second warning,