13 For it is not those who hear the law who are righteous in God’s sight, but it is those who obey the law who will be declared righteous.

Read Romans 2:13 Using Other Translations

(For not the hearers of the law are just before God, but the doers of the law shall be justified.
For it is not the hearers of the law who are righteous before God, but the doers of the law who will be justified.
For merely listening to the law doesn’t make us right with God. It is obeying the law that makes us right in his sight.