'According to the Law' in the Bible

and the lampstands of pure gold with their lamps, so that they should burn according to the Law before the holy place;

and commanded Judah to seek the LORD God of their fathers, and to do according to the law and commandment.

Jehoiada then assigned the duties of the Lord's temple to the priests, the Levites whom David had assigned to the Lord's temple. They were responsible for offering burnt sacrifices to the Lord with joy and music, according to the law of Moses and the edict of David.

And they stood in their place after their manner, according to the law of Moses the man of God: the priests sprinkled the blood, which they received of the hand of the Levites.

Everything that Hezekiah began in the service of God's Temple was done according to the Law and to the commandments as he sought his God, worked with all of his heart, and became successful.

And they roasted the passover lamb with fire according to the Law. But the holy offerings they boiled in pots, and in kettles, and in pans, and carried to all the sons of the people.