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Legendary characteristics of Isipatana
According to the Buddhist commentarial scriptures, all the Buddhas preach their first sermon at the Migadāya in Isipatana. It is one of the four avijahitatthānāni (unchanging spots), the others being the bodhi-pallanka, the spot at the gate of Sankassa, where the Buddha first touched the earth on his return from Tāvatimsa, and the site of the bed in the Gandhakuti in Jetavana
In past ages Isipatana sometimes retained its own name, as it did in the time of Phussa Buddha (Bu.xix.18), Dhammadassī Buddha (BuA.182) and Kassapa Buddha (BuA.218). Kassapa was born there (ibid., 217). But more often Isipatana was known by different names (for these names see under those of the different Buddhas). Thus in the time of Vipassī Buddha, it was known as Khema-uyyāna. It is the custom for all Buddhas to go through the air to Isipatana to preach their first sermon. Gotama Buddha, however, walked all the way, eighteen leagues, because he knew that by so doing he would meet Upaka, the Ajivaka, to whom he could be of service
