'Keep the Law' in the Bible

But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.

Forasmuch as we have heard, that certain which went out from us have troubled you with words, subverting your souls, saying, Ye must be circumcised, and keep the law: to whom we gave no such commandment:

Go with these, and make yourself clean with them, and make the necessary payments for them, so that they may be free from their oath: and everyone will see that the statements made about you are not true, but that you put yourself under rule, and keep the law.