'According to the Law' in the Bible

When the time came for their purification according to the Law of Moses, Joseph and Mary took Jesus up to Jerusalem to present him to the Lord,

Then some men came down from Judea and started to teach the brothers, "Unless you are circumcised according to the Law of Moses, you can't be saved."

At this Paul told him, "God will strike you, you whitewashed wall! How can you sit there and judge me according to the Law, and yet in violation of the Law order me to be struck?"

In this passage he says, "You never wanted or took delight in sacrifices, offerings, burnt offerings, and sin offerings," which are offered according to the Law.