The priests were too few, to wit, such as were sanctified and fit for their work, as the following words show; for otherwise the number of the priests was more than sufficient for this employment. They could not flay all the burnt-offerings; and much less all the other sacrifices, which were more numerous; the flaying whereof was the priest's proper work, Leviticus 1:5,6. The Levites did help them; necessity excusing their deviation from the rule, as it hath excused others in like cases.
Related Commentaries of 2 Chronicles 29:34
2 Chronicles 29:34
34 But the priests were too few, so that they could not flay all the burnt offerings: wherefore their brethren the Levites did helph them, till the work was ended, and until the other priests had sanctified themselves: for the Levites were more upright in heart to sanctify themselves than the priests.