'Keep the Law' in the Bible

But there rose up certain of the sect of the Pharisees who believed, saying, It is needful to circumcise them, and to command them to keep the law of Moses.

Since we have heard that certain who went out from us have troubled you with words, unsettling your souls, saying, You must be circumcised, and keep the law: to whom we gave no such commandment:

Them take, and purify yourself with them, and pay their expenses, that they may shave their heads: and all may know that those things, of which they were informed concerning you, are nothing; but that you yourself also walk orderly, and keep the law.

For circumcision verily profits, if you keep the law: but if you are a breaker of the law, your circumcision is made uncircumcision.

For neither they themselves who are circumcised keep the law; but desire to have you circumcised, that they may glory in your flesh.