Hindu texts Prior to the start of the common era, the Hindu texts were composed orally, then memorized and transmitted orally, from one generation to next, for more than a millennia before they were written down into manuscripts. This verbal tradition of preserving and transmitting Hindu texts, from one generation to next, continued into the modern era. The Vedas are a large body of Hindu texts originating in ancient India, with its Samhita and Brahmanas complete before about 800 BCE. Composed in Vedic Sanskrit hymns, the texts constitute the oldest layer of Sanskrit literature and the oldest scriptures of Hinduism. Hindus consider
Vedas Brahmanas (commentaries on rituals, ceremonies and sacrifices), and the Upanishads (texts discussing meditation, philosophy and spiritual knowledge). Some scholars add a fifth category – the Upasanas (worship). The various Indian philosophies and denominations have taken differing positions on the Vedas. Schools of Indian philosophy which cite the Vedas as their scriptural authority are classified as "orthodox" (āstika). Other śramaṇa traditions, such as Lokayata, Carvaka, Ajivika, Buddhism and Jainism, which did not regard the Vedas as authorities, are referred to as "heterodox" or "non-orthodox" (nāstika) schools. Despite their differences, just like the texts of the śramaṇa traditions, the layers of texts