John Gill Commentary 2 Chronicles 31:12

"And they brought in the oblations and the tithes and the dedicated things faithfully: and over them Conaniah the Levite was ruler, and Shimei his brother was second." — 2 Chronicles 31:12 (ASV)

And brought in the offerings, and the tithes, and the
dedicated things, faithfully
Kept nothing back for their own private use, but faithfully delivered in and laid up the whole that was brought which remained; this was done by the priests and Levites, in whose hands and care they were:

over which Cononiah the Levite was ruler, and Shimei his brother was
the next ;
these two had the charge and care of the whole, the one as deputy to the other.