Matthew 12:39 contains the identical saying about the sign of Jonah, reinforcing the rebuke to this generation.

Matthew 12:40 explains the sign: Jonah's three days in the fish prefigure the Son of Man's three days in the earth.

Matthew 12:39 records the same saying about the sign of Jonah earlier—reinforcing Jesus' consistent stance toward a sign-seeking generation.

Matthew 27:40 records mockers demanding a sign at the cross, echoing the earlier sign-seeking that Jesus denied.

Jonah 1:17 provides the OT event referenced as the sign of Jonah — three days in the fish.

Mark 8:12 records Jesus refusing any sign, omitting the 'sign of Jonah' exception found in Matthew.

Luke 11:29 parallels Matthew 16:4, saying no sign except the sign of Jonah.

In Deuteronomy 32:5, Moses calls Israel a 'perverse and crooked generation'—the same language Jesus uses for 'wicked and adulterous generation'.

In Isaiah 57:3, Israel is called 'offspring of an adulterer'—the same spiritual adultery Jesus condemns in this 'adulterous generation'.

Luke 9:41 uses 'unbelieving generation' in a rebuke, echoing the same harsh characterization of faithlessness.

James 4:4 calls readers 'adulterous people' for spiritual unfaithfulness, directly echoing Jesus' indictment of the generation.

Luke 11:30 interprets the sign as Jonah being a sign to Nineveh, pointing to Jesus as a sign.