I Chronicles 23:28-29

because their duty was to help the sons of Aaron in the service of the house of the LORD, in the courts and in the chambers, in the purifying of all holy things and the work of the service of the house of God, both with the showbread and the fine flour for the grain offering, with the unleavened cakes and what is baked in the pan, with what is mixed and with all kinds of measures and sizes