Definition:
In European folklore, the witching hour is the time when supernatural creatures such as witches, demons and ghosts are thought to be at their most powerful, and black magic at its most effective. This hour is typically midnight, and the term may now be used to refer to midnight, or any late hour, even without having the associated superstitious beliefs.
In neopaganism, it is sometimes used to refer solely to midnights occurring during a full moon, when a witch's power is supposedly at its greatest.
I seriously doubt you would find any scripture on such a thing. The Bible would just call someone out as a witch or sorcerer, etc. I don't believe the Holy Spirit would tend to be a resource for details of Wicca.
Where you coming from on this, or what you trying to study on this G?