'According to the Law' in the Bible

And one Ananias, a devout man according to the law, well reported of by all the Jews that dwelt there,

Then said Paul unto him, God shall smite thee, thou whited wall: and sittest thou to judge me according to the law, and commandest me to be smitten contrary to the law?

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