'According to the Law' in the Bible

And a certain Ananias, a devout man according to the law, having a good report by all the Jews who dwell there,

Then Paul said to him, God is going to smite thee, a whitewashed wall. Thou even sit judging me according to the law, and violating law, thou command me to be struck?

But this I confess to thee, that according to the Way that they call a sect, so serve I the paternal God, believing all things written according to the law and the prophets,