John Gill Commentary 2 Kings 12:16

"The money for the trespass-offerings, and the money for the sin-offerings, was not brought into the house of Jehovah: it was the priests`." — 2 Kings 12:16 (ASV)

The trespass money and sin money was not brought into the
house of the Lord
Which was the money persons at a distance sent for their trespass and sin offerings instead of cattle, with which the sacrifices were bought; and what remained of the money was not brought into the temple, and made use of in the above manner:

it was the priest's ;
the overplus of it, and such of the sacrifices which by the law were appropriated to them.