2 Chronicles 29:34

But the priests were too few, so that they were unable to skin all the burnt offerings; therefore their brothers the Levites helped them until the work was completed and until the other priests had consecrated themselves. For the Levites were more conscientious to consecrate themselves than the priests.

2 Chronicles 30:3

since they could not celebrate it at that time, because the priests had not consecrated themselves in sufficient numbers, nor had the people been gathered to Jerusalem.

2 Chronicles 35:11

They slaughtered the Passover animals, and while the priests sprinkled the blood received from their hand, the Levites skinned them.

Numbers 8:15

Then after that the Levites may go in to serve the tent of meeting. But you shall cleanse them and present them as a wave offering;

Numbers 8:19

I have given the Levites as a gift to Aaron and to his sons from among the sons of Israel, to perform the service of the sons of Israel at the tent of meeting and to make atonement on behalf of the sons of Israel, so that there will be no plague among the sons of Israel by their coming near to the sanctuary.”

Numbers 18:3

And they shall thus attend to your obligation and the obligation of all the tent, but they shall not come near to the furnishings of the sanctuary and the altar, or both they and you will die.

Numbers 18:6-7

Behold, I Myself have taken your fellow Levites from among the sons of Israel; they are a gift to you, dedicated to the Lord, to perform the service for the tent of meeting.

1 Chronicles 29:17

Since I know, O my God, that You try the heart and delight in uprightness, I, in the integrity of my heart, have willingly offered all these things; so now with joy I have seen Your people, who are present here, make their offerings willingly to You.

2 Chronicles 29:5

Then he said to them, “Listen to me, O Levites. Consecrate yourselves now, and consecrate the house of the Lord, the God of your fathers, and carry the uncleanness out from the holy place.

2 Chronicles 30:16-17

They stood at their stations after their custom, according to the law of Moses the man of God; the priests sprinkled the blood which they received from the hand of the Levites.

Psalm 7:10

My shield is with God,
Who saves the upright in heart.

Psalm 26:6

I shall wash my hands in innocence,
And I will go about Your altar, O Lord,

Psalm 94:15

For judgment will again be righteous,
And all the upright in heart will follow it.

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 animals, and while the priests sprinkled the blood received from their hand, the Levites skinned them.
Numbers 8:15
Then after that the Levites may go in to serve the tent of meeting. But you shall cleanse them and present them as a wave offering;
Numbers 18:3
And they shall thus attend to your obligation and the obligation of all the tent, but they shall not come near to the furnishings of the sanctuary and the altar, or both they and you will die.

For the levites

2 Chronicles 30:3
since they could not celebrate it at that time, because the priests had not consecrated themselves in sufficient numbers, nor had the people been gathered to Jerusalem.

Upright

1 Chronicles 29:17
Since I know, O my God, that You try the heart and delight in uprightness, I, in the integrity of my heart, have willingly offered all these things; so now with joy I have seen Your people, who are present here, make their offerings willingly to You.
Psalm 7:10
My shield is with God,
Who saves the upright in heart.
Psalm 26:6
I shall wash my hands in innocence,
And I will go about Your altar, O Lord,
Psalm 94:15
For judgment will again be righteous,
And all the upright in heart will follow it.