'Example' in the Bible

In writing this much, brethren, with special reference to Apollos and myself, I have done so for your sakes, in order to teach you by our example what those words mean, which say, "Nothing beyond what is written!" --so that you may cease to take sides in boastful rivalry, for one teacher against another.

If the bugle--to take another example--gives an uncertain sound, who will prepare for battle?