What does the Bible say about the sign of Jonah?

The sign of Jonah, as referenced by Jesus, signifies the three days and three nights He spent in the tomb, paralleling the time Jonah spent in the belly of the great fish. This imagery is not merely a historical account, but a profound revelation pointing toward the redemptive work of Christ. Jonah serves as a picture of Christ as our substitute, emphasizing our need for a savior who conquers death and offers us life. Just as Jonah was cast out to calm the raging sea, so Christ was cast into death to bear the wrath of God in our place.