Jonah 1:1-2, Now the word of the Lord came unto Jonah the son of Amittai, saying, 2 Arise, go to Nineveh, that great city, and cry against it; for their wickedness is come up before me.
Jonah 3:4, And Jonah began to enter into the city a day's journey, and he cried, and said, Yet forty days, and Nineveh shall be overthrown.
We cannot add to the word of God, just read it, believe it, and form our theology around what it says not what it does not say. Jonah was to cry against Nineveh telling them that they were going to be destroyed.