Matthew 12:38-42

The sign of Jonah (38-42)
For parallel see Lk 11:16,29-32.
v.38-40 The scribes and Pharisees want to see a sign from Jesus to prove his authority. Given all the signs Jesus was performing, I’m not sure what kind of sign they wanted. Jesus answers that an evil and adulterous generation (they had become unfaithful to God) wants a sign but the only sign they will get is the sign of the prophet Jonah. Jonah was in the belly of the great fish three days and three nights (Jon 1:17). The son of man, Jesus says, will be in the heart of the earth (the grave) three days and three nights. He is of course referring to his burial and resurrection 3 days later.
v.41 The people of Nineveh repented at Jonah’s preaching (Jon 3:6-10). This of course confirms the historicity of the account of Jonah. Something greater than Jonah was in their midst and so they would be condemned for their unbelief.
v.42 The queen of Sheba would condemn that generation because she traveled great distances to hear Solomon’s wisdom (1 Kgs 10:1-13) and something greater than Solomon was present (Jesus).

Read Matthew 12:38-42