John Gill Commentary 2 Chronicles 35:12

"And they removed the burnt-offerings, that they might give them according to the divisions of the fathers` houses of the children of the people, to offer unto Jehovah, as it is written in the book of Moses. And so did they with the oxen." — 2 Chronicles 35:12 (ASV)

And they removed the burnt offerings
Either such of the lambs and kids as were designed for burnt offerings for the people; these they separated from those that were for the passover; or they removed from them what was to be burnt, the fat of the inwards, of the kidneys, and the caul on the liver:

that they might give ;
the rest for the passover:

according to the divisions of the families of the people, to offer
unto the Lord ;
according to the number of them:

as it is written in the book of Moses ;
see (Leviticus 3:3–5) ,

and so did they with the oxen ;
such of them as were appointed for burnt offerings were set apart by themselves, and such as were for peace offerings; what of them were to be burnt, as those before mentioned, were taken from them.