Adam Clarke on Psalms 37:20

The enemies of the Lord shall be as the fat of lambs - This verse has given the critics some trouble. Several of the Versions read thus: "But the enemies of the Lord, as soon as they are exalted to honor, shall vanish; like smoke they vanish." If we follow the Hebreto, it intimates that they shall consume as the fat of lambs. That is, as the fat is wholly consumed in sacrifices by the fire on the altar, so shall they consume away in the fire of God's wrath.