A frequent misinterpretation portrays this verse as glorifying gratuitous violence or divine favoritism toward one nation, detached from its context in Psalm 136's litany of God's redemptive acts; it overlooks that the smiting of these kings was righteous judgment against oppressors who rejected peace offers and the refrain of 'his mercy endureth for ever,' which frames the event as merciful protection for Israel rather than arbitrary aggression.
Psalms 136:17
King James Version (1769)
17 To him which smote great kings: for his mercy endureth for ever:
This verse praises God for His mighty acts in overthrowing powerful kings, such as Sihon and Og, who opposed Israel's entry into the Promised Land, emphasizing that these victories were expressions of His enduring mercy toward His chosen people, demonstrating His unwavering faithfulness in delivering them from enemies and fulfilling His covenant promises throughout their history.