Jonah 3: 1-5. 10
Jonah goes into the huge city of Nineveh to warn the people that God is going to destroy it.  Because the people hear and respond, God spares the city. 

1 Corinthians 7: 29-31
Paul warns his readers that the world as we know it is passing away. 

Mark 1: 14-20
Jesus calls the first disciples – Simon Peter and Andrew, followed by James and John – from their jobs as fishermen, to follow him.  And they do it at once.