'Keep the Law' in the Bible

But some of the sect of the Pharisees, who believed, arose, saying, that it was necessary to circumcise them, and to command them to keep the law of Moses.

Inasmuch as we have heard that certain persons went out from us and troubled you with words, subverting your souls, saying, That you must be circumcised, and keep the law, to whom we gave no commandment,

Take them, and join with them in their vow of abstinence, and pay their expenses, in order that they may shave their heads; and all will know that the things which they have heard reported of you are nothing; but that you yourself also walk orderly, and keep the law.