Once again the Lord spoke to Jonah.
He said, "Go to Nineveh, that great city, and proclaim to the people the message I have given you."
So Jonah obeyed the Lord and went to Nineveh, a city so large that it took three days to walk through it.
Jonah started through the city, and after walking a whole day, he proclaimed, "In forty days Nineveh will be destroyed!" 1
References for Jonah 3:4
3.4, 5 Mt 12.41; Lk 11.32.