19. If thou shalt slay, etc. It is unnatural to seek, as some have done, to connect this with the preceding verse. Nor does it seem proper to view the words as expressing a wish — “I wish,” or, “Oh! if thou God wouldst slay the wicked.” Neither can I subscribe to the idea of those who think that David congratulates himself upon the wicked being cut off. The sentiment seems to me to be of another kind, that he would apply himself to the consideration of the divine judgments, and advance in godliness and in the fear of his name, so often as vengeance was taken upon the ungodly. There can be no question that God designs to make an example of them, that his elect ones may be taught by their punishment to withdraw themselves from their society. David was of himself well disposed to the fear and worship of God, and yet he needed a certain check, like other saints, as Isaiah says, (Isaiah 26:9,) “when God has sent abroad his judgments, the inhabitants of the earth shall learn righteousness,” that is, to remain in the fear of the Lord. At the same time, I have no doubt that the Psalmist presents himself before God as witness of his integrity; as if he had said, that he came freely and ingenuously to God’s bar, as not being one of the wicked despisers of his name, nor having any connection with them.