2 Chronicles 29:34
But the priests were too few, so that they could not flay all the burnt offerings: why their brothers 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.
Torrey's Topical Textbook—AKJV

Psalm 125:4
Do good, O LORD, to those that be good, and to them that are upright in their hearts.
Torrey's Topical Textbook—AKJV