'Law of Moses' in the Bible

Jehoiada appointed the officers of the house of the LORD under the hand of the priests the Levites, whom David had distributed in the house of the LORD, to offer the burnt offerings of the LORD, as it is written in the law of Moses, with rejoicing and with singing, according to the order of David.

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