2 Chronicles 29:34

But the priests were too few, and they were not able to offer all the burnt offerings, so their brothers, the Levites, strengthened them to finish the work, and until the [rest of] the priests consecrated themselves. (For the Levites [were] {more conscientious} to sanctify themselves than the priests.)

2 Chronicles 30:3

but they were not able to make it at that time, for the priests had not consecrated themselves {in sufficient numbers}, and the people had not been assembled in Jerusalem--

2 Chronicles 35:11

And they slaughtered the Passover [lamb], and the priests sprinkled [the blood] from their hand, and the Levites flayed [the sacrifices].

Numbers 8:15

And after this the Levites will come to serve [at] the tent of assembly, and you will purify them, and you {will offer} them [as] a wave offering.

Numbers 8:19

And I have given the Levites; they are given to Aaron and his sons from the midst of the {Israelites} to do the work of the {Israelites} in the tent of the assembly and to make atonement for the {Israelites}, so a plague will not be among the {Israelites} when the {Israelites} come near the sanctuary."

Numbers 18:3

They will keep your responsibility and the responsibility of all the tent, only they may not come near the vessels of the sanctuary and the altar, so both you and they will not die.

Numbers 18:6-7

Look, I myself have chosen your brothers the Levites from the midst of the children. They are a gift to you given from Yahweh to perform the work of the tent of assembly.

1 Chronicles 29:17

And I know, my God, that you yourself test the heart and are pleased with uprightness. I, in the uprightness of my heart, have willingly offered all these [things], and now I have seen your people who are found here willingly offer to you.

2 Chronicles 29:5

And he said to them, "Hear me, O Levites! Sanctify yourselves now, and sanctify the house of Yahweh, the God of your ancestors, and bring out the defilement from the sanctuary.

2 Chronicles 30:16-17

Then they stood at their positions according to custom, according to the law of Moses the man of God. The priests were sprinkling the blood from the hand of the Levites.

Psalm 7:10

My shield [is] with God who saves the upright of heart.

Psalm 26:6

I will wash my hands in innocence, and I will walk about your altar, O Yahweh,

Psalm 94:15

For judgment will return to righteousness, and all the upright in heart [will follow] after 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
And they slaughtered the Passover [lamb], and the priests sprinkled [the blood] from their hand, and the Levites flayed [the sacrifices].
Numbers 8:15
And after this the Levites will come to serve [at] the tent of assembly, and you will purify them, and you {will offer} them [as] a wave offering.
Numbers 18:3
They will keep your responsibility and the responsibility of all the tent, only they may not come near the vessels of the sanctuary and the altar, so both you and they will not die.

For the levites

2 Chronicles 30:3
but they were not able to make it at that time, for the priests had not consecrated themselves {in sufficient numbers}, and the people had not been assembled in Jerusalem--

Upright

1 Chronicles 29:17
And I know, my God, that you yourself test the heart and are pleased with uprightness. I, in the uprightness of my heart, have willingly offered all these [things], and now I have seen your people who are found here willingly offer to you.
Psalm 7:10
My shield [is] with God who saves the upright of heart.
Psalm 26:6
I will wash my hands in innocence, and I will walk about your altar, O Yahweh,
Psalm 94:15
For judgment will return to righteousness, and all the upright in heart [will follow] after it.