2 Corinthians 5:20, 21

So we are Christ's ambassadors, God making His appeal as it were through us. We [as Christ's personal representatives] beg you for His sake to lay hold of the divine favor [now offered you] and be reconciled to God.

For our sake He made Christ [virtually] to be sin Who knew no sin, so that in and through Him we might become [endued with, viewed as being in, and examples of] the righteousness of God [what we ought to be, approved and acceptable and in right relationship with Him, by His goodness].