Did you see my reply to your question about 3 days and 3 nights? I think it is what you are looking for.
As far as the point of it, Jesus is the temple that would be torn down and raised up in 3 days (John 2:19), but the Jewish leaders did not understand what Jesus meant. They thought He was talking about the literal Jewish temple that had been under construction for forty-six years.
Check out those links I sent you in regards to how the Jewish ear would have interpreted “three days and three nights,” as they did not mean 24-hour increments as some might interpret it in our current time.