Albert Barnes Commentary Isaiah 57:12

"I will declare thy righteousness; and as for thy works, they shall not profit thee." — Isaiah 57:12 (ASV)

I will declare thy righteousness - This is evidently spoken ironically. The sense is, ‘you have devoted yourselves to idols, and you have sought the aid of foreigners. I will now announce to you the true nature of the deliverance which they can bring to you.’ This is done in the following verse.