The Levites: Services of Preparing the Sacrifices for the Priests
Source: TTT
1 Chronicles 23:31
Whenever burnt offerings were presented to the LORD on the Sabbaths, New Moons, and appointed feasts, they were to serve regularly before the LORD in the numbers prescribed for them.
2 Chronicles 35:11
And they slaughtered the Passover lambs, while the priests sprinkled the blood handed to them and the Levites skinned the animals.