In Matthew 16:1-4 the Saduccees and Pharisees ask for a sign. This is a strange request in light of the many miracles Christ had done to this point. Their goal, like many skeptics today who make similar demands for proofs, is to hide their rebellion against God behind the request for a sign. The reality is Christ had done enough to make himself known such that the request can only be interpreted as disingenuous. Ultimately, Christ tells them that the only sign that will be given to them is the sign of Jonah.