What is the meaning of Matthew 12:40?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

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.

Berean Standard Bible (BSB)

For as Jonah was three days and three nights in the belly of the whale, so will the Son of Man be three days and three nights in the heart of the earth.

World English Bible (WEB)

For{G1063} as{G5618} Jonas{G2495} was{G2258}{(G5713)} three{G5140} days{G2250} and{G2532} three{G5140} nights{G3571} in{G1722} the whale's{G2785} belly{G2836}; so{G3779} shall the Son{G5207} of man{G444} be{G2071}{(G5704)} three{G5140} days{G2250} and{G2532} three{G5140} nights{G3571} in{G1722} the heart{G2588} of the earth{G1093}.

Strong's King James

For exactly as YONAH WAS THREE DAYS AND THREE NIGHTS IN THE BELLY OF A SEA MONSTER, so the Son of Humanity will be three days and three nights in the heart of the land.

The F.O.G*

[40] For just as Jonah spent three days and nights in the belly of a huge fish, so I, the Son of Man, will spend three days and nights in the heart of the earth.

The F.O.G Paraphrase

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.

Young's Literal Translation