What does Judges 9:38 mean?
Only when his planned ambush is complete does Zebul reveal his allegiance to King Abimelech. So far, he apparently had Gaal convinced he was loyal to the noblemen of the city of Shechem. They thought he supported their plan to replace Abimelech with Gaal (Judges 9:22–27). Instead, Zebul has orchestrated a raid that takes advantage of the local terrain and the rising sun (Judges 9:30–35). When the attack first came, Gaal thought he saw troops approaching. Zebul told him it was a trick of the light, only for Gaal to again insist he saw an approaching enemy (Judges 9:36–37).Now, with Abimelech's forces almost on top of the city, Zebul taunts Gaal with the truth. He asks about Gaal's boasting, arrogant talk of taking over by force (Judges 9:28–29). Gaal went to far as to say he'd dare Abimelech to raise an even larger army and then come fight; now Abimelech is there, in person, and ready for battle. Zebul's sarcasm pointedly refers to Gaal's mouth—a snide remark about his "big talk."
Even if Gaal wanted to take back his words, it's too late. Abimelech and his four companies of soldiers are bearing down, so Zebul forces Gaal to stand behind his words: these are the very men you mocked. Go out and fight them! To his credit, Gaal will not back down, though he will suffer defeat (Judges 9:39–41).