What does Judges 9:42 mean?
Abimelech is still angry with Shechem. The city was disloyal to his appointed rule (Judges 9:22–25). On the previous day, he defeated a rebellion by the city's leaders and a man named Gaal (Judges 9:26–29; 39–40). Many of the leaders were wounded and likely lost their positions of power in the city.As far as Scripture has recorded so far, the common citizens of Shechem were not involved in the rebellion against Abimelech. They did not participate in the battle of the previous day. They seem to assume Abimelech was content to run Gaal out of town and punish the city's leaders. So, they go out to work the fields as on any other day. Their intent seems only to accomplish their regular work. When Abimelech is told this, he sees an opportunity to punish the entire population of Shechem for not standing with him.