Joab brings up the story of Abimelech, who died when a woman dropped a millstone on his head from a city wall. He uses this example to warn the messenger that David might accuse the army of repeating old, foolish mistakes by getting too close to the city walls during the fight.

The Hebrew word for millstone is rechev, which refers to a heavy grinding stone. The detail is vivid and memorable, showing how a single overlooked danger can change the outcome of a battle—and a life.

This verse pushes back against the idea that history doesn’t matter. Joab expects David to remember past failures and use them to judge current actions. It’s a reminder that leaders often measure today’s choices by yesterday’s disasters, sometimes unfairly.

We all have moments when someone brings up our past mistakes to question our decisions. Joab’s warning shows how easily people can get trapped by history, and how important it is to learn from it without letting it define every choice. Sometimes, knowing the stories that haunt others helps us communicate more wisely.