1 Chronicles 23:27–29

According to the last instructions of David, the Levites were counted from those twenty years old or more.

The duty of the Levites was to help Aaron’s descendants in the service of the temple of the Lord: to be in charge of the courtyards, the side rooms, the purification of all sacred things and the performance of other duties at the house of God. They were in charge of the bread set out on the table, the special flour for the grain offerings, the thin loaves made without yeast, the baking and the mixing, and all measurements of quantity and size.

for according to the last words of David, the Levites twenty years old or more were to be counted—“but their duty will be to assist the descendants of Aaron with the service of the Lord’s temple, being responsible for the courts and the chambers, the purification of all the holy things, and the work of the service of God’s temple—as well as the rows of the Bread of the Presence, the fine flour for the grain offering, the wafers of unleavened bread, the baking, the mixing, and all measurements of volume and length.

In accordance with David’s final instructions, all the Levites twenty years old or older were registered for service.

The work of the Levites was to assist the priests, the descendants of Aaron, as they served at the house of the Lord. They also took care of the courtyards and side rooms, helped perform the ceremonies of purification, and served in many other ways in the house of God. They were in charge of the sacred bread that was set out on the table, the choice flour for the grain offerings, the wafers made without yeast, the cakes cooked in olive oil, and the other mixed breads. They were also responsible to check all the weights and measures.

For by the last words of David, they are the number of the sons of Levi, from twenty years old and above. For their station was to assist the sons of Aaron with the service of the house of Yahweh, over the courtyards, over the chambers, and over the cleansing of all the sanctified objects, and with the work of the service of the house of God, and with the rows of bread, the flour, the grain offering, the wafers of unleavened bread, the baked offering, the offering mixed with oil, and for all the amounts and measurements.

For by the last words of David the Levites were numbered from twenty years old and above: Because their office was to wait on the sons of Aaron for the service of the house of the Lord, in the courts, and in the chambers, and in the purifying of all holy things, and the work of the service of the house of God; Both for the shewbread, and for the fine flour for meat offering, and for the unleavened cakes, and for that which is baked in the pan, and for that which is fried, and for all manner of measure and size;