'Law of Moses' in the Bible

And Jehoiada appointed the offices of the house of Jehovah under the hand of the priests, the Levites, whom David had set by classes over the house of Jehovah to offer up Jehovah's burnt-offerings, as it is written in the law of Moses, with rejoicing and with singing according to the directions of David.

And they stood in their place after their custom, according to the law of Moses the man of God: the priests sprinkled the blood receiving it from the hand of the Levites.