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Meeting the Buddha

After leaving Sañjaya, Upatiṣya encountered the monk Aśvajit (Pali: Assaji), one of the Buddha's first five arhat disciples. Upatiṣya noticed how serene the monk appeared and approached him to ask for a teaching. Aśvajit said he was still newly ordained but would teach what he can, and proceeded to teach the famous Ye Dharma Hetu stanza:

Of all those things that from a cause arise,

Tathagata the cause thereof has told;

And how they cease to be, that too he tells,

This is the doctrine of the Great Recluse.

This stanza has become particularly famous in the Buddhist world, having been inscribed onto many Buddhist statues. According to philosopher Paul Carus, the stanza breaks away from the idea of divine intervention prevalent in ancient Brahmanism at the time and instead teaches that the origin and end of all things depends on its causation.

Following the teaching, Upatiṣya attained sotapanna, the first stage of enlightenment. Upatiṣya then went to Kolita to tell him about the incident and, after reciting the stanza for him, Kolita also attained sotapanna. The two friends, along with a large chunk of Sañjaya's disciples, then ordained as monks under the Buddha, with everybody in the group becoming arhats that day except for Upatiṣya and Kolita. Nyanaponika Thera states that the friends required longer preparatory periods before enlightening in order to fulfill their roles as chief disciples. Several texts describe the ordination with miraculous elements, such as the disciples' clothes suddenly being replaced with Buddhist robes and their hair falling out on its own. After ordaining, Upatiṣya started being called Śāriputra (Pali: Sāriputta), and Kolita started being called Maudgalyāyana (Pali: Moggallāna).

After Śāriputra and Maudgalyāyana ordained, the Buddha declared them his two chief disciples (Pali: aggasavaka), following the tradition of appointing a pair of chief disciples as the past Buddhas did, according to Buddhist belief. Since they were newly ordained some of the monks in the assembly felt offended, but the Buddha explained that he gave them the roles because they had made the resolve to become the chief disciples many lifetimes ago. Maudgalyāyana attained arhatship seven days after ordaining following intense meditation training. Śāriputra attained arhatship two weeks after ordaining while fanning the Buddha as the Buddha was delivering the Vedanāpariggaha Sutta to a wandering ascetic. Pali texts state that the ascetic was Śāriputra's nephew but Chinese, Tibetan and Sanskrit texts state he was Śāriputra's uncle. According to commentaries such as the Atthakatha, Śāriputra took longer to achieve enlightenment than Maudgalyāyana because his knowledge had to be more thorough as first chief disciple, and thus required more preparation time.