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Schubring has made an effort to evaluate the traditions of the sages in his preface to Isibhasiyam39. According to him Yajnavalkya, Bahuk (Nala). Arun Mahashalputra or Aruni, and Uddalak clearly appear to be of Upanishadic tradition. at the same time Ping, Rishigiri, and Shrigiri have been titled Brahmin Parivrajak and Ambad as Parivrajak. As such, these four are also connected with Brahmin tradition. Yogandharayan, who had dialogue with Ambad, also appears to be a sage of Brahmin tradition. Similarly Madhurayan, Aryayan, Tarayan (Narayan) also seem to be belonging to Brahmin tradition. Angiras and Varishen Krishna are also believed to be from Brahmin tradition. According to Schubring, Mahakashyap, Sariputta, and Vajjiyaputra are connected with Buddhist tradition. I feel that he is correct. Schubring has expressed his inability to attach any tradition to Pushpshalputra, Ketaliputra, Vidu, Gathapatiputra, Tarun, Harigiri, Matang and Vayu, in absence of any evidence.
If we examine Schubrings views on the basis of available evidence, Narad, Asit Deval, Angiras Bhardwaj, Yajnavalkya, Uddalak, Ping and Narayan can be conclusively accepted as sages of Vedic or Upanishadic tradition. Similarly, I have no objection in accepting Mahakashyap, Säriputta and Vajjiputta as belonging to the Buddhist tradition. Parshwa and Vardhaman are conclusively from Jain tradition. The remaining names need to be studied from a variety of angles.
Although it is difficult to ascertain the historical existence and tradition of Pushpshalputra, Valkalchiri, Kummaputra, Ketaliputta, Bhayali, Madhurayan, Sauryayan, Aryayan, Gardabhali, Gathapatiputra, Tarun, Varatraya, Aardrak, Vayu, Sanjaya, Indranaga, Som, Yama, Varun, Vaishraman etc., if we analyse their histroical existence on the basis of their mention available in the Jain, Buddhist, and Vedic traditions we may arrive at some conclusion.
Prof. C. M. Upasak has given such an evaluation in his article titled 'Isibhasivam and Pali Buddhist text.,' but he has limited this study only to Buddhist Tripitak literature. In this preface I am trying to go a step ahead of the efforts of Schubring and Upasak. with authenticity based on comparative and critical
Rishibhashit : A Study 147