'Law of Moses' in the Bible

Also Jehoiada appointed the oversight of the house of the LORD to the hands of the priests, the Levites, whom David had assigned 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, as it was ordained by David.

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