Then Hezekiah said, “You have now consecrated yourselves to the Lord. Come near; bring sacrifices and thank offerings to the house of the Lord.” And the assembly brought sacrifices and thank offerings, and all who were of a willing heart brought burnt offerings. The number of the burnt offerings that the assembly brought was 70 bulls, 100 rams, and 200 lambs; all these were for a burnt offering to the Lord. And the consecrated offerings were 600 bulls and 3,000 sheep. But the priests were too few and could not flay all the burnt offerings, so until other priests had consecrated themselves, their brothers the Levites helped them, until the work was finished—for the Levites were more upright in heart than the priests in consecrating themselves. Besides the great number of burnt offerings, there was the fat of the peace offerings, and there were the drink offerings for the burnt offerings. Thus the service of the house of the Lord was restored. And Hezekiah and all the people rejoiced because God had provided for the people, for the thing came about suddenly. 2 Chronicles 29:31-36.
The Levites were the grunts of the ministry. The hauled things, assembled things and cleaned things. The priests were allowed to make sacrifices, burn incense, and perform other special duties. But the priests had to consecrate themselves with ritual washing and anointing with oil. So, why were there not enough priests ready? The text tells us the Levites had to give a hand because they were more upright and were prepared. They had consecrated themselves.
It may be that most of the priests presumed they were not needed. Somebody else had this. They may not have been ready for so many sacrifices. But the Levites got to shine that day because they were ready.
Make yourself ready, for you don’t know what demands may be made. The men in suits may not be ready. And the ministry must be done.