The Fravarane has the same job in Zoroastrian life that a baptismal creed has in Christian life: it is what a person says when they take on the religion. At the navjote, the rite in which a child is first invested with the sudreh, the sacred shirt, and the kusti, the cord tied about the waist, the initiate recites the declaration and is thereafter responsible for the daily prayers and the moral obligations that go with them.
The confession does not stop at the rite. Untying and retying the kusti with the accompanying prayers is done several times a day, and the declaration recurs in that round, so the words said once at initiation are said again for a lifetime. This is a pattern the atlas records elsewhere: a confession that marks entry and is then repeated so often that it becomes the texture of ordinary observance rather than a single decisive moment.
Both Parsi and Irani Zoroastrian communities hold it, and it is one of the elements that has stayed stable across a diaspora, a long period under other rulers, and considerable variation in other practice. For a small and dispersed community, a text recited at every initiation and in every day's prayers does work that institutions elsewhere do through hierarchy and canon law.