Jonah three days in the fish
The Old Testament
Now the LORD had appointed a great fish to swallow Jonah, and Jonah spent three days and three nights in the belly of the fish.
Jonah 1:17
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In the New Testament
For as Jonah was three days and three nights in the belly of the great fish, so the Son of Man will be three days and three nights in the heart of the earth.
Matthew 12:40
BSB
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Jonah spends three days and three nights in the belly of a great fish and comes out alive.
When people ask Jesus for a sign, he names the 'sign of Jonah'. As Jonah was three days in the fish, so the Son of Man will be three days in the heart of the earth. In Jewish reckoning part of a day counts as a day.