'Keep the Law' in the Bible

But there rose up, said they, certain of the sect of the Pharisees who believed, saying, That we ought to circumcise them, and command them to keep the law of Moses.

Forasmuch as we have heard, that some who came from us have troubled you with words, unsettling your minds, saying, Ye must be circumcised, and keep the law, whom we commanded not.