The verse employs symbolic language to convey God's supreme authority over various nations. Moab being referred to as a washbasin suggests a role of servitude or a tool for cleansing, indicating that it is under God's control and used for His purposes. In ancient customs, tossing a sandal was a gesture of claiming ownership or asserting authority, so when God says He tosses His sandal on Edom, it signifies His dominion and control over the land. The shout of triumph over Philistia symbolizes victory and conquest, reinforcing the idea that God is victorious over all adversaries.
These metaphors collectively emphasize God's sovereignty and His ability to subdue and govern nations according to His will. For believers, this serves as a reminder of God's ultimate power and the assurance that He is in control of the world's affairs. It reassures them of His protection and the fulfillment of His promises, encouraging trust in His divine plan and authority.