The subject of sin continues. God is proving that sin is everyone’s problem. All have sinned (v. 23) whether Jew or Gentile there is no difference (v. 22).
V.9 All are under sin, but the Lord Jesus was made sin for us (2 Cor. 5:21). See also 1 Peter 2:24. How great the price that was paid to put it away!
V.10-18 Taken from seven different Old Testament scriptures, these verses prove that the whole human race, in all ages, stands guilty before a holy God. Paul must have read the Old Testament carefully.
V.21-31 Big “BUT,” God here opens up the great contrast. He gives us a Person — His beloved Son — to buy us back (redeem us) to Him.