The Fravashis were among the most distinctive divine beings of the Iranian religion: pre-existent souls, guardian spirits, the ancestral beings who had existed before the creation of the material world, who descended into bodies at birth, and who returned to their original state after death. Every righteous person had his fravashi — his pre-existent and post-mortem soul — and the fravashis of all the righteous together formed a great heavenly host, an army of guardian spirits who fought beside Ahura Mazda in the cosmic war.
The Fravardin Yasht (Yasht 13) is the great catalog of the fravashis; over one hundred and fifty are named in it, including the fravashis of Zarathushtra and his early disciples, of the great heroes of Iranian history, of the kings of the Kayanian dynasty, and of the various foreign peoples who had embraced the Mazdean religion. The list is one of the most historically valuable passages in the Avesta, preserving names of figures who would otherwise be lost; many of the names listed are otherwise unattested in the surviving texts.
The fravashis were honored particularly during the last ten days of the Iranian year, the festival of Hamaspathmaedaya (modern Persian Farvardīgān), when they returned to their old homes to visit their living descendants. Households were cleaned, the family fire was rekindled, food was set out for the visiting fravashis, and prayers were offered for their continued protection. The festival was the Iranian equivalent of the various Mediterranean festivals of the dead (the Roman Parentalia, the Greek Genesia, the Hebrew rabbinic mourning practices), and it survived in folk practice into modern times.
The fravashis had a special role in the cosmic war. Before the creation of the material world, when Ahura Mazda was deciding whether to confront Angra Mainyu directly or to invite the unborn human souls to fight on his side, the fravashis themselves had voluntarily descended into bodies to take their part in the battle. They had not had to come; they had chosen to. So every human life was, in the Iranian conception, a voluntary enlistment in the cosmic war, undertaken before birth, lived out in the body, and consummated after death when the fravashi returned to its heavenly state.



