You who are trying to be justified by the Law have been severed from Christ; you have fallen away from grace. But by faith we eagerly await through the Spirit the hope of righteousness. (Galatians 5:4,5)
The whole letter of Galatians is basically addressed to Judaizers, those who think that somehow our righteous standing before God is a result of our own actions and so require obedience to the Law to attain salvation.