In the Death Note
In the Death Note, the rule "If you want to specify details of the death, you must do so within the next 6 minutes and 40 seconds" has a reference to the Bible. The number 6 represents man, as he was created on the sixth day of creation, while the number 40 is used as a reference to the time of a chastisement or a difficult journey. For example, the 40 days of the flood and the 40 years of the Jews crossing the desert... Did you know?