Law of God
Scripture contains both commands to obey (law) and promises to believe for salvation (gospel). These are not antithetical to each other. Instead, they play indispensable yet different roles in the lives of Christians.
If we want to love Christ as he deserves and as he desires, we will keep his commandments (John 14:15). And that means as we keep in step with the Spirit, we would do well to remember the Ten Commandments.