C. F. Keil and Franz Delitzsch on 2 Chronicles 28:10

2Ch 28:10 “And now the sons of Judah and Jerusalem ye purpose to subject to yourselves for bondmen and bondwomen!” יהוּדה בּני is accus., and precedes as being emphatic; i.e., your brethren, whom the wrath of God has smitten, you purpose to keep in subjection. אתּם also is emphatically placed, and then is again emphasized at the end of the sentence by the suffix in לכם: “Are there not, only concerning you, with you, sins with Jahve your God?” i.e., Have you, to regard only you, not also burdened yourselves with many sins against the Lord? The question הלא, is a lively way of expressing assurance as to a matter which is not at all doubtful.