In Zoroastrianism
Sizdah Bedar has also its roots in the Zoroastrian belief that laughter and joy symbolize the throwing away of all bad thoughts. According to Zoroastrianism, the bad thoughts are coming from the Devil Angra Mainyu (in Middle Persian: Ahriman) and the celebrations of New Year and Sizdah Bedar will cleanse all bad thoughts. Avesta, the holy scripture of the Zoroastrian faith, recalls that all those who love purity were responsible for celebrating Sizdah Bedar to help the Angel of Goodness prevail over the earth in the struggle against the Evil and the Devil.
Read more about this topic: Sizdah Be-dar