Charles Ellicott Commentary Jeremiah 4:28

"For this shall the earth mourn, and the heavens above be black; because I have spoken it, I have purposed it, and I have not repented, neither will I turn back from it." — Jeremiah 4:28 (ASV)

For this shall the earth mourn ... —As with all true poets, the face of nature seems to the prophet to sympathize with human suffering. (Matthew 24:29.)