'Complete' in the Bible

and the priests were unable to complete their duties because of the cloud, since the glory of the LORD had filled God's Temple.

Because there weren't enough priests, they were unable to prepare all the burnt offerings until other priests came forward after having consecrated themselves, so their descendant of Levi relatives assisted them until the services were complete. (The descendants of Levi had been more conscientious in consecrating themselves than had been the priests.)