Bundahishn
Chapter XXXII
On the kindred of Pôrûshasp, son of Paîtirâsp, son of Aurvadasp, son of Hâêkadâsp, son of Kakhshnûs, son of Pâîtîrasp, son of Hardarsn, son of Hardâr, son of Spîtâmân, son of Vîdast, son of Ayazem, son of Ragan, son of Dûrâsrôb, son of Mânûskîhar.
As Paîtirâsp had two sons, one Pôrûshasp and one Ârâsti, by Pôrûshasp was Zaratûst begotten for a sanctuary of good religion, and by Ârâsti was Mêdyôk-mâh begotten.
Zaratûst, when he brought the religion, first celebrated worship and expounded in Aîrân-vêg, and Mêdyôk-mâh received the religion from him.
Again, I say, by Zaratûst were begotten three sons and three daughters; one son was Isadvâstar, one Aûrvatad-nar, and one Khûrshêd-kîhar; as Isadvâstar was chief of the priests he became the Môbad of Môbads, and passed away in the hundredth year of the religion; Aûrvatad-nar was an agriculturist, and the chief of the enclosure formed by Yim, which is below the earth; Khûrshêd-kîhar was a warrior, commander of the army of Pêshyôtanû, son of Vistâsp, and dwells in Kangdez; and of the three daughters the name of one was Frên, of one Srît, and of one Pôrukîst.
Aûrvatad-nar and Khûrshêd-kîhar were from a serving (kakar) wife, the rest were from a privileged (pâdakhshah) wife.
By Isadvâstar was begotten a son whose name was Ururviga, and they call him Arang-i Bîrâdân ('fore-arm of brothers') for this reason, that, as they were from a serving wife, she then delivered them over to Isadvâstar through adoption.
This, too, one knows, that three sons of Zaratûst, namely, Hûshêdar, Hûshêdar-mâh, and Sôshyans, were from Hvôv; as it says, that Zaratûst went near unto Hvôv three times, and each time the seed went to the ground; the angel Nêryôsang received the brilliance and strength of that seed, delivered it with care to the angel Anâhîd, and in time will blend it with a mother.
Nine thousand, nine hundred, and ninety-nine, and nine myriads of the guardian spirits of the righteous are intrusted with its protection, so that the demons may not injure it.