יונה ג:י פירוש: רש״י ומלבי״ם

and God will relent—He will think about the evil to repent of it.

God saw what they did: that is, at first, they only regretted what they had done, but did not repent with acts that would rectify their past sins. But after the king's order, God saw through all of their acts that they had repented. They repented by actually returning stolen items and those obtained unfairly...