The "Sign of Jonah" is recorded in Matthew 12:40. However , it begins in Mt 12:39b.

"...there shall be no sign given to it" (an evil generation)" but the sign of the prophet Jonas. For as Jonas was three days and three nights in the whale's belly so shall the son of man be three days and three nights in the heart of the earth."

124 can be read as a date. January 24. Mt 12.40.

The Strong's greek word for Jonah is G2495. Now go back from January 24 ,2020 (2495 days)..... you land on March 26,2013 which is 15 Nisan. ....the EXACT DAY the LORD was buried "in the heart of the earth".

More at SteveFletcher's link , here...

https://youtu.be/5vtM2jdJ71o