Joshua warned during his last speech what severe punishment would God would inflict for worshiping other gods?

ANSWER

God will turn and bring disaster on them

Joshua 24 :

19 Joshua said to the people, “You are not able to serve the LORD. He is a holy God; he is a jealous God. He will not forgive your rebellion and your sins. 20 If you forsake the LORD and serve foreign gods, he will turn and bring disaster on you and make an end of you, after he has been good to you.”
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