A fire temple, Agiary, Atashkadeh (آتشکده), Atashgah (آتشگاه) or Dar-e Mehr (در مهر) is the place of worship for the followers of Zoroastrianism, the ancient religion of Iran (Persia). In the Zoroastrian religion, fire (see atar), together with clean water (see aban), are agents of ritual purity. Clean, white "ash for the purification ceremonies [is] regarded as the basis of ritual life", which "are essentially the rites proper to the tending of a domestic fire, for the temple [fire] is that of the hearth fire raised to a new solemnity". For, one "who sacrifices unto fire with fuel in his hand ..., is given happiness". there were 167 fire temples in the world, of which 45 were in Mumbai, 105 in the rest of India, and 17 in other countries. Of these only 9 (1 in Iran and 8 in India) are the main temples known as atash behrams and the remaining are the smaller temples known as agiarys. Atar First evident in the 9th century BCE, the Zoroastrian rituals of fire are contemporary with that of Zoroastrianism itself. It appears at approximately the same time as the shrine cult and is roughly contemporaneous with the introduction of Atar as a divinity. There is no allusion to a temple of fire in the Avesta proper, nor is there any Old Persian language word for one. That the rituals of fire was a doctrinal modification and absent from early Zoroastrianism is also evident in the later Atash Nyash. In the oldest passages of that liturgy, it is the hearth fire that speaks to "all those for whom it cooks the evening and morning meal", which Boyce observes is not consistent with sanctified fire. The temple is an even later development: from Herodotus it is known that in the mid-5th century BCE the Zoroastrians worshipped to the open sky, ascending mounds to light their fires. Strabo confirms this, noting that in the 6th century, the sanctuary at Zela in Cappadocia was an artificial mound, walled in, but open to the sky, although there is no evidence whatsoever that the Zela-sanctuary was Zoroastrian.