NET

19 This was the order in which they carried out their assigned responsibilities when they entered the Lord’s temple, according to the regulations given them by their ancestor Aaron, just as the Lord God of Israel had instructed him.

Darby

19 This is their ordering in their service to come into the house of Jehovah, according to their ordinance, through Aaron their father, as Jehovah the God of Israel had commanded him.

KJV

19 These [were] the orderings of them in their service to come into the house of the LORD, according to their manner, under Aaron their father, as the LORD God of Israel had commanded him.