'Pursuer' in the Bible

[Say to the ruler] “Give us advice, make a decision [for Moab, king of Judah];Cast your shadow [over us] like night in the midst of noon;Hide the outcasts, do not betray the fugitive [to his pursuer].

All her beauty and majestyHave departed from the Daughter of Zion (Jerusalem).Her princes have become like deerThat have found no pasture;They have fled without strengthBefore the pursuer.