Whenever the three days and three nights of Matthew 12:40 is brought up in a "discussion" with 6th day crucifixion folks, they frequently suggest that it is a Jewish idiom for counting any part of a day as a whole day. I wonder if anyone has documentation that shows an example from the first century or before regarding a period of time that is said to consist of a specific number of days as well as a specific number of nights where the period of time absolutely doesn't/can't include at least a part of each one of the specific number of days and at least a part of each one of the specific number of nights?