A common misinterpretation overlooks the prophetic link to Jesus' resurrection, reducing the passage to merely a comparison of preaching ministries between Jonah and Jesus, ignoring the explicit 'sign' motif tied to Jonah's three days in the fish as foreshadowing Christ's triumph over death; others might apply it superficially to modern miraculous signs or end-times events without recognizing its fulfillment in the historical resurrection, thus diluting its evidential power for faith in Jesus as the Messiah.
Luke 11:30
King James Version (1769)
30 For as Jonas was a sign unto the Ninevites, so shall also the Son of man be to this generation.
Jesus declares that just as Jonah became a miraculous sign to the Ninevites through his emergence from the great fish after three days, so he, the Son of Man, will be a profound sign to his own generation, pointing specifically to his own death, burial, and resurrection after three days, which serves as the ultimate validation of his divine authority and messianic identity, calling people to repentance amid their unbelief.