Joshua 12:21 lists the defeated kings by the Israelites under Moses and Joshua's leadership. It serves as a historical record of the victories God granted His people as they entered the Promised Land. This verse highlights the fulfillment of God's promise to give the land to the descendants of Abraham, Isaac, and Jacob. It showcases the faithfulness of God in fulfilling His covenant with Israel and demonstrates His power in enabling them to conquer their enemies. Overall, Joshua 12:21 underscores the importance of trusting in God's promises and following His guidance in achieving victory.