Psalms 109:18
As he clothed himself with cursing like as with his garment, so let it come into his bowels like water, and like oil into his bones. As he clothed himself with cursing like as with his garment, so let it come into his bowels like water, and like oil into his bones.
The verse stands in an imprecatory psalm invoking judgment, a plea for divine justice that predicts God's retributive wrath and justice upon evildoers. Its curses are predictive and typify the tribulation coming upon the enemies of God's church. It has been set forth as an example of material that some found difficult to reconcile with the Sermon on the Mount.
Its curses are God's inspired declaration of the punishment awaiting the wicked, not David's personal prayer for harm to his enemies and not an incitement to personal revenge, nor matter he added on his own apart from inspiration. The curse returns upon those who intended to inflict it on others and whose lives were wholly evil. Those who plot wickedness against the innocent receive its consequences on their own heads, like the curse they embraced returning to them.
Cursing is portrayed as a garment, a besetting sin that can be laid aside. Those covered with it may exchange it for the white robes of righteousness given to the children of the Redeemer's kingdom.