God saw their works, that they turned from their evil way. God repented of the evil which he said he would do to them, and he didn't do it.
God repeated his command to Jonah to go and preach in Nineveh, and this time Jonah obeyed (3:1-3). God’s message was that within forty days Nineveh would, because of its wickedness, be overthrown. The Ninevites, leaders and common people alike, heeded the warning and turned in repentance to God (4-5). The king even issued a decree commanding a moral reformation in the city (6-9). As a result of the Ninevites’ repentance, God withdrew his threat of destruction (10).