The Avesta is a holy book. 

The Avesta is a set of holy books. 


The Avesta is a collection of holy books. 

Later, people made a new alphabet. This helped them write the texts down. They made a large set of books. This set was called the Sasanian Avesta. Sadly, that large set was lost later on. Only a small part of it remains today. 
The Avesta is a collection of sacred writings for Zoroastrianism. 

For a very long time, these words were not written down. Instead, they were shared through oral tradition. This means people memorized the texts and spoke them out loud. This happened over many centuries. Some parts were composed between the 15th and 4th centuries BCE. During this time, the texts were passed from person to person. Some parts were very fixed and did not change much. Other parts were more fluid and changed with each new poet-priest. Eventually, the way people shared these words became fixed for everyone.
History tells us many different stories about how the Avesta was made. 
Writing the Avesta changed everything for the tradition. 
We can still study the Avesta today by looking at its parts. The most important text is called the Yasna. It is used during a specific ceremony. Other parts include the Vendidad and the Visperad. There are also shorter texts in the Khordeh Avesta, or "Little Avesta." 
The Avesta is the central collection of religious literature for Zoroastrianism. 
The development of the Avesta occurred in complex, overlapping stages. Scholars divide the corpus into two main layers: Old Avestan and Young Avestan. The Old Avestan material is likely much older. Many researchers believe it was created between 1500 and 900 BCE. Some suggest a date closer to 1000 BCE is most probable. These older texts contain no specific geographical names. This makes it impossible to say exactly where they were composed. In contrast, the Young Avestan texts form the majority of what remains today. 
The way these texts were shared changed how they were written. The Old Avestan texts likely became a fixed liturgical corpus very early on. This means the words were memorized precisely for religious use. The Young Avestan texts were different for a long time. They were part of a fluid oral tradition. In this stage, poet-priests might add new material with each generation. Eventually, this fluid process stopped and the Young Avestan texts also became fixed. This second crystallization likely happened during the Old Iranian period. 
Zoroastrian tradition offers several legends regarding the history of these texts. One myth claims the god Ahura Mazda created twenty-one books called nasks. These were supposedly brought to Zoroaster by divine means. Another legend involves a Parthian emperor named Valaksh. He supposedly collected fragments that had been scattered or destroyed. Other stories credit Sasanian-era priests like Tansar and Adurbad Mahraspandan with organizing the texts. Tansar is said to have collected scattered works and approved only authoritative parts. Adurbad Mahraspandan then performed a general revision to ensure orthodoxy. However, modern scholars generally reject these legends in favor of linguistic evidence.
A major turning point occurred during the Sasanian era, between 224 and 651 CE. During this time, the Avestan alphabet was created. This allowed for the written transmission of the oral traditions. This resulted in a massive, multi-volume edition known as the Sasanian Avesta. This edition was organized thematically by subject matter. Unfortunately, this complete collection was lost after the Islamic conquest of Iran. Only a small portion of the Sasanian Avesta survived. We know this because 9th and 10th-century commentators mentioned many more verses than exist today. Only about one-quarter of the sentences they referenced can be found in surviving texts.
The surviving manuscripts are organized differently than the lost Sasanian edition. Instead of being grouped by theme, they correspond to specific ceremonies. The most important text is the Yasna, which is named after the ceremony where it is recited. 
Modern study of the Avesta began in Europe during the 18th century. In 1755, Abraham Hyacinthe Anquetil-Duperron traveled to India to find these texts. He discovered them among the Parsi Zoroastrian communities. His early translations were initially doubted but were eventually accepted as genuine. In the 20th century, scholars like Karl Hoffmann changed how we understand the text. He showed that inconsistencies in the spelling were not errors from transcription. Instead, they were caused by the natural changes that happen during oral recitation. Today, more than 300 manuscripts are cataloged by researchers worldwide.
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