4 in order that the righteous requirement of the law might be fully met in us, who do not live according to the flesh but according to the Spirit.

Read Romans 8:4 Using Other Translations

That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit.
in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit.
He did this so that the just requirement of the law would be fully satisfied for us, who no longer follow our sinful nature but instead follow the Spirit.