From the Gospel of Jesus Christ according to Luke 11,15-26. 
At that time, after Jesus had shattered a demom, some said: "It is in the name of Beelzebub, leader of the demons, that he casts out the demons."
Others then, to test him, asked him for a sign from heaven.
Knowing their thoughts, he said: «Each kingdom divided in itself is in ruins and one house falls on the other.