Beliefs in the afterlife vary among Wiccans, although reincarnation is a traditional Wiccan teaching. Raymond Buckland said that a soul reincarnates into the same species over many lives in order to learn and advance one's soul, but this belief is not universal. A popular saying amongst Wiccans is "once a witch, always a witch", indicating that Wiccans are the reincarnation of earlier witches.
Typically, Wiccans who believe in reincarnation believe that prior to this, the soul rests for a while in the Otherworld or Summerland, known in Gardner's writings as the "ectasy of the Goddess". Many Wiccans believe in the ability to contact the spirits of the dead who reside in the Otherworld through spirit mediums and ouija boards, particularly on the sabbat of Samhain, though some disagree with this practice, such as High Priest Alex Sanders, who stated "they are dead; leave them in peace". This belief was likely influenced by Spiritualism, which was very popular at the time, and which Gardner had had experience with.
Despite some belief in it, Wicca does not place an emphasis on the afterlife, focusing instead on the current one; as the historian Ronald Hutton remarked, "the instinctual position of most pagan witches, therefore, seems to be that if one makes the most of the present life, in all respects, then the next life is more or less certainly going to benefit from the process, and so one may as well concentrate on the present".
Source: lilith-dark-moon.blogspot.com