Charles Ellicott Commentary Jonah 3:10

"And God saw their works, that they turned from their evil way; and God repented of the evil which he said he would do unto them; and he did it not." — Jonah 3:10 (ASV)

And God repented. —See Note, Genesis 6:6.

And he did it not. —As we are entirely ignorant of the nature of the threatened destruction, so are we also of the mode in which it was averted. Possibly some inscription throwing light on the book of Jonah may yet be discovered.