One of the books of the Iranian peoples is called the Avesta. It is not really one book, but a collection of many books, but together they are called the Avesta. The Avesta is the holy book of Zoroastrianism. The language of the Avesta is very similar to the language of the RigVeda. The Avesta also has asuras and devas. But in Iran they are written as "ahura" and "daeva".