Matthew 12:39-40

39But he answered them, a“An evil and badulterous generation seeks for a sign, but no sign will be given to it except the sign of the prophet Jonah. 40For cjust as Jonah was three days and three nights in the belly of the great fish, dso will the Son of Man be three days and three nights in the heart of the earth.

Mark 8:12

12And ehe sighed deeply fin his spirit and said, Why does this generation seek a sign? Truly, I say to you, no sign will be given to this generation.”

Mark 8:38

38For gwhoever is ashamed of me and of my words in this hadulterous and sinful generation, of him will the Son of Man also be ashamed iwhen he comes in the glory of his Father with jthe holy angels.”

Acts 2:40

40And with many other words he bore witness and continued to exhort them, saying, kSave yourselves from this lcrooked generation.”
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