The question is whether we can separate the law of God from the covenant promises. The law in the Old Testament was always a covenant law. Why was the law and the covenant connected? Because God was putting Himself on notice that He alone would fulfill the requirements of the law in order to show Himself faithful in His covenant promises. Christ was the covenant keeper.The Psalmist invokes the covenant promises as a defense for Israel. In this case, he appeals to God based on God's faithfulness and righteousness. Now, this covenant is eternal. So the Psalmist always petitions God for the fulfillment of His covenant promise to be seen in Israel, either through the perfect obedience of the people or through the Mediator on behalf of Israel. The Covenant lawgiver created the world and promises to govern His creation by protecting His covenant people.The Psalmist prays to God to curse the wicked nation that opposes Israel, so that God's kingdom may be established on earth. He cites the law of God that curses the wicked, the curses that remove all opposition, the decrees that establish God's kingdom, the statutes that establish Israel as a nation of laws, and the promises that are gifts of God in ruling the world. The Psalmist prays to God, asking for help in defeating the enemy nation. To curse the wicked people, so that they will be removed from power. For God to establish God's kingdom on Earth, and to make Israel a nation of laws. Lastly, he asks for God to give the people the gifts they need to rule the world.