For just as Jonah was a sign to the Ninevites, so also will the Son of man be to this generation
Other versions
King James Version
For as Jonas was a sign unto the Ninevites, so shall also the Son of man be to this generation.English Standard Version
For as Jonah became a sign to the people of Nineveh, so will the Son of Man be to this generation.New International Version
For as Jonah was a sign to the Ninevites, so also will the Son of Man be to this generation.