Treasury of Scripture Knowledge

Summary

But the priests were too few, so that they could not flay all the burnt offerings: wherefore their brethren the Levites did help 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.

For the levites

Bible References

Their brethren

2 Chronicles 35:11
They slaughtered the Passover lambs. The priests sprinkled the blood with their hands while the Levites skinned the lambs.
Numbers 8:15
Once you have made them clean and presented them as an offering, the Levites may come and do their work at the tent of meeting.
Numbers 18:3
They are to fulfill their duties to you and their responsibilities for the tent. However they must not have any contact with sacred objects in the Holy Place or with the altar. If they do, both they and you will be put to death.

For the levites

2 Chronicles 30:3
They could not celebrate it at the regular time because not enough priests had performed the ceremonies to make themselves holy and the people had not gathered in Jerusalem.

Upright

1 Chronicles 29:17
I well know, O my God, that you test everyone's heart and are pleased with people of integrity. In honesty and sincerity I have willingly given all this to you. I have seen how your people who are gathered here have been happy to bring offerings to you.
Psalm 7:10
God is my shield who saves the upright in heart.
Psalm 26:6
I will wash my hands in innocence. I will walk around your altar, O Jehovah.
Psalm 94:15
For judgment will again be righteous. The upright in heart will follow it.