'According to the Law' in the Bible

Also day by day, from the first day until the last day, he read in the Book of the Law of God. And they kept the feast seven days, and on the eighth was an assembly, according to the Law.

At the same time were there men appointed over the treasure chests - wherein were the Heave offerings, the firstlings and the tithes - that they should gather them out of the fields about the cities, to distribute them unto the priests and Levites according to the law: for Judah was glad of the priests, and Levites,