2 Chronicles 35:3-5

And he said to the Levites, the teachers of all Israel, who were holy to the Lord, See, the holy ark is in the house which Solomon, the son of David, king of Israel, made; it will no longer have to be transported on your backs: now be the servants of the Lord your God and his people Israel, And make yourselves ready in your divisions, by your families, as it is ordered in the writings of David, king of Israel, and of Solomon his son; And take your positions in the holy place, grouped in the families of your brothers, the children of the people, and for every division let there be a part of a family of the Levites.