Matthew 12:40

For just as Jonah was three days in the sea-monster's belly, so will the Son of Man be three days in the heart of the earth.

Matthew 16:4

A wicked and faithless generation are eager for a sign; but none shall be given to them except the sign of Jonah." and He left them and went away.

Luke 11:30

For just as Jonah became a sign to the men of Nineveh, so the Son of Man will be a token to the present generation.

Treasury of Scripture Knowledge

Summary

Now the LORD had prepared a great fish to swallow up Jonah. And Jonah was in the belly of the fish three days and three nights.

General references

Bible References

In

Matthew 12:40
For just as Jonah was three days in the sea-monster's belly, so will the Son of Man be three days in the heart of the earth.
Matthew 16:4
A wicked and faithless generation are eager for a sign; but none shall be given to them except the sign of Jonah." and He left them and went away.
Luke 11:30
For just as Jonah became a sign to the men of Nineveh, so the Son of Man will be a token to the present generation.

General references

Luke 11:30
For just as Jonah became a sign to the men of Nineveh, so the Son of Man will be a token to the present generation.