Matthew 12:34 An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas; for as Jonas was three days and three nights in the whale's belly, so shall the Son of Man be three days and three nights in the heart of the earth.
Mark 8:12 Verily I say unto you, There shall no sign be give unto this generation, save the sign of the prophet Jonah; for as Jonah was three days and three nights in the whale's belly, so likewise shall the Son of Man be buried in the bowels of the earth.
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