The Nuttall Encyclopedia
Certain supernatural beings presumed, agreeably to a very old belief (Lev. xix. 31), to attend magicians or sorcerers, and to be at their beck and call on any emergency.
Wood, James, ed. Entry for 'Familiar Spirits'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/f/familiar-spirits.html. Frederick Warne & Co Ltd. London. 1900.