Matthew 12:38-40

Young's Literal Translation

³⁸ Then answered certain of the scribes and Pharisees, saying, `Teacher, we will to see a sign from thee.'

³⁹ And he answering said to them, `A generation, evil and adulterous, doth seek a sign, and a sign shall not be given to it, except the sign of Jonah the prophet;

⁴⁰ for, as Jonah was in the belly of the fish three days and three nights, so shall the Son of Man be in the heart of the earth three days and three nights.