Whenever the three days and three nights of Matthew 12:40 is brought up in a “discussion” with 6th day crucifixion folks, they frequently argue that it is a common Jewish idiom for counting any part of a day as a whole day. I wonder if anyone (who thinks that the crucifixion took place on the 6th day of the week and who thinks that the "heart of the earth" means the tomb) knows of any writing that shows that a phrase stating a specific number of days and/or a specific number of nights was ever used in the first century or before when it absolutely couldn't have included at least parts of each one of the specific number of days and at least parts of each one of the specific number of nights?