1 Corinthians 10:6-8, 11

These things happened as a warning to us, so that we would not crave evil things as they did, or worship idols as some of them did. As the Scriptures say, “The people celebrated with feasting and drinking, and they indulged in pagan revelry.” And we must not engage in sexual immorality as some of them did, causing 23,000 of them to die in one day.

These things happened to them as examples for us. They were written down to warn us who live at the end of the age.