'According to the Law' in the Bible

One Ananias, a devout man according to the law, well reported of by all the Jews who lived in Damascus,

Then Paul said to him, "God will strike you, you whitewashed wall! Do you sit to judge me according to the law, and command me to be struck contrary to the law?"

But this I confess to you, that after the Way, which they call a sect, so I serve the God of our fathers, believing all things which are according to the law, and which are written in the prophets;