Charles Ellicott Commentary Jeremiah 16:10

"And it shall come to pass, when thou shalt show this people all these words, and they shall say unto thee, Wherefore hath Jehovah pronounced all this great evil against us? or what is our iniquity? or what is our sin that we have committed against Jehovah our God?" — Jeremiah 16:10 (ASV)

What is our iniquity? ... —Now, as before (Jeremiah 5:19), the threats of judgment are met with words of real or affected wonder. “What have we done to call for all this? In what are we worse than our fathers, or than other nations?” All prophets had more or less to encounter the same hardness. It reaches its highest form in the reiterated questions of the same type in Malachi 1:2.