Charles Ellicott Commentary Psalms 59:5

"Even thou, O Jehovah God of hosts, the God of Israel, Arise to visit all the nations: Be not merciful to any wicked transgressors. Selah" — Psalms 59:5 (ASV)

Therefore ... —Better, Yea, even Thou ... Not only is there an emphatic “thou,” but the passion of prayer cannot exhaust itself without accumulating all the customary names of the Divine Being.

God of Israel. —This is added so emphatically because of the “heathen,” against whom aid is invoked.

All the heathen ... wicked transgressors. —These two terms are not synonymous, but contrasted. There were not only foreign, but domestic foes, namely, the party who, pretending to be loyal Israelites, were yet intriguing with the foreigners. The literal “coverers of wickedness” implies concealment and treachery.