Final answer:
Zarathustra's hymns, central to Zoroastrianism, are known as the Gathas and form a key part of their religious scriptures.
Step-by-step explanation:
The hymns attributed to the founder of Zoroastrianism, Zarathustra, are called the Gathas. These hymns are a crucial part of the Zoroastrian scriptures and are considered to be some of the oldest within the religion, reflecting the teachings of Zarathustra himself. The Gathas are understood to contribute significantly to the Zoroastrian understanding of the world's divine order, including the worship of their deity, Ahura Mazda, which translates to "enlightened wisdom".