Sefer Yetzirah, also known as the "Book of Creation," is an ancient Jewish mystical text attributed to Abraham. It explores the creation of the universe through the manipulation of the Hebrew alphabet and the ten Sefirot, which represent different aspects of divine emanation. The text is foundational in Kabbalah, a form of Jewish mysticism. The Sefer Yetzirah outlines how the letters of the Hebrew language can be combined to form the building blocks of reality. It emphasizes the relationship between language, thought, and creation, suggesting that understanding these connections can lead to spiritual enlightenment and a deeper comprehension of the universe.