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28.Samyutta Nikaya 7.3 - The Discourse on the Asura King.
Translation text：fotuo.pro/post/130.html
Introduction: Three months after the Buddha's parinirvana in 543 BC, Venerable Mahakasyapa led five hundred arhats to sit for a rainy season retreat in Rajagaha. King Ajatasattu presided over the first council (Ajatasattu was the king of Magadha, an ancient kingdom in India and a contemporary of the Buddha), during which Ven. Ananda recited the Sutta Pitaka and Ven. Upali recited the Vinaya Pitaka. Other contemporaries of the Buddha included King Pasenadi (the king of Kosala, another ancient kingdom in India) who sought teachings from him on many occasions and received much guidance from him. The disciples of the Buddha then passed down his teachings orally until they were compiled into what is now known as Pali Canon or Tipitaka. After two more councils held within India, about two hundred years after the Buddha's parinirvana, Emperor Ashoka sent his son Mahinda Thera and a group of monks to bring three sets of scriptures to Sri Lanka where they were preserved and studied by generations thereafter.
The language used to transmit these texts is called "Magadhi" or "Mula-Bhasa," later referred to as "Pali," which means sacred language. During his lifetime, most of what he taught was spoken in Magadhi dialects prevalent at that time; hence Pali became known as root language because it was used by him personally when teaching Dharma.
To truly learn about Buddhism according to its original teachings, one must study Pali Canon since it contains all that has been transmitted through oral tradition since Lord Buddha's time on earth - this is considered authentic Buddhism at its core!