John Gill Commentary 2 Chronicles 28:10

"And now ye purpose to keep under the children of Judah and Jerusalem for bondmen and bondwomen unto you: [but] are there not even with you trespasses of your own against Jehovah your God?" — 2 Chronicles 28:10 (ASV)

And now you purpose to keep under the children of Judah and
Jerusalem for bondmen and bondwomen to you
This was shown by taking and bringing captive such a number of them, contrary to the law, (Leviticus 25:39–46)

but are there not with you, even with you, sins against the Lord your
God ?
for which they deserved to be chastised as well as their brethren the men of Judah, and might expect it, and especially if they used them in a barbarous manner, and contrary to the will of God.