The Rule of Three (also threefold law or law of return) is a tenet of Wicca. claiming that whatever energy a person puts out into the world, be it positive or negative, will be returned to that person three times.
John J. Coughlin states that " . . . there is a literal reward or punishment tied to one's actions, particularly when it comes to working magic," and that "there are many Wiccans, experienced and new alike, who view the Law of Return as an over-elaboration on the Wiccan Rede."
The Rule of Three has been compared by Karl Lembke to other ethics of reciprocity, such as the concept of karma in Dharmic religions and the Christian edict, "Do unto others as you would have them do unto you" (Matthew 7:12), also called the "Golden Rule."
One version of the Law is written: "Ever mind the Rule of Three, three times what thou givest returns to thee, this lesson well, thou must learn, thee only gets what thou dost earn."
The Rule of Three has its prototype in a piece of Wiccan liturgy which first appeared in print in Gerald Gardner's 1949 novel High Magic's Aid:
'Thou hast obeyed the Law. But mark well, when thou receivest good, so equally art bound to return good threefold.' (For this is the joke in witchcraft, the witch knows, though the initiate does not, that she will get three times what she gave, so she does not strike hard.)