Romans 11

Paul again speaks of the law of Moses and its relationship with the gospel of Jesus Christ -

"And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work."  (Romans 11:6)

Obviously, Paul is teaching that man cannot be saved by the law of Moses.  Yet grace still has its condition -

"And of his fulness have all we received, and grace for grace.
17 For the law was given by Moses, but grace and truth came by Jesus Christ."  (John 1:16–17)