NET
30 For just as Jonah became a sign to the people of Nineveh, so the Son of Man will be a sign to this generation.
Darby
30 For as Jonas was a sign to the Ninevites, thus shall also the Son of man be to this generation.
KJV
30 “For as Jonas was a sign unto the Ninevites, so shall also the Son of man be to this generation.”