What is Śāriputra?
Śāriputra (Sāriputta in Pāli) was the chief disciple of the historical Buddha and the figure the early canon names foremost in wisdom (paññā). He is the primary source the Theravāda tradition traces its Abhidharma analytical literature to, and the figure the Mahāyāna Heart Sūtra addresses by name to deliver its teaching of emptiness.
The Brahmin who outran his teacher
Born Upatissa to a Brahmin family in Nālaka, also called Nāla or Upatissa-gāma, near the city of Rājagṛha in Magadha. His mother's name was Sārī, and the matronymic Śāri-putra ('son of Sārī') became his standard name in the saṅgha. With his lifelong friend Kolita, later known as Mahāmaudgalyāyana and the second chief disciple, he first studied under the wandering-ascetic teacher Sañjaya Belaṭṭhiputta. When both had exhausted what that curriculum could offer, they made a pact: whichever first found the deathless would tell the other. The meeting came when Śāriputra encountered the bhikkhu Assaji on the road and asked him to describe his teacher's instruction. Assaji answered with a four-line gāthā on dependent origination: of those phenomena that arise from a cause, the Tathāgata has told their cause, and also their cessation. According to the canonical account, those lines were enough. Śāriputra entered the stream on the spot and brought Kolita to the Buddha before the day was out.
His role in the saṅgha
In the order around the Buddha, Śāriputra was called the elder brother of the saṅgha and paired with Maudgalyāyana as the two chief disciples (agra-śrāvaka in Sanskrit, aggasāvaka in Pāli). The early texts assign each a distinct register: Maudgalyāyana was foremost in psychic and meditative power (ṛddhi), Śāriputra in wisdom and analysis (paññā). Several sustained discourses in the Majjhima and Saṃyutta Nikāyas are recorded as Śāriputra's own teaching. Among the best known: the Mahāhatthipadopama Sutta's exposition of the four noble truths through the five aggregates, the Anaṅgaṇa Sutta's analysis of the blemishes of the mind, and the Saccavibhaṅga Sutta's unpacking of the truth-formulae. The Theravāda tradition treats Śāriputra as the proximal source of the Abhidhamma Piṭaka, the canonical analytical literature whose authorship the Pāli commentaries trace to him. The systematising work that produced Buddhaghosa's Visuddhimagga stands, on the tradition's own account, downstream of the analytic register Śāriputra established.
The Mahāyāna inversion
The Mahāyāna Prajñāpāramitā sūtras inherit Śāriputra as a named character but give him a different role. In the Heart Sūtra, the bodhisattva Avalokiteśvara addresses the teaching of emptiness directly to Śāriputra by name: form is emptiness, emptiness form; no eye, no ear, no nose, no tongue; no suffering, no origination, no cessation, no path. The choice of addressee is deliberate. In the Mahāyāna literary economy, Śāriputra stands for the Abhidharmic project: the careful enumeration of dharmas, the parsing of the five aggregates, the analytical reduction of experience to its parts. That project has done all the work it can do. The Prajñāpāramitā then shows that the analytical categories themselves are empty. The texts do not present Śāriputra as wrong, only as standing at the limit of what his method can reach, with emptiness as the next step. Across both traditions he appears in two roles: the Theravāda's master of analysis, and the Mahāyāna's exact interlocutor for the teaching that takes that analysis as its starting point and dissolves it from within.
Śāriputra, Maudgalyāyana, and Ānanda
Śāriputra is one of three disciples the early texts distinguish most sharply. Maudgalyāyana, his lifelong companion, shared the rank of chief disciple but was foremost in psychic power (ṛddhi) rather than analytical wisdom. Ānanda was the Buddha's personal attendant and custodian of the spoken teachings. He memorised the discourses and recited them at the First Council after the Buddha's death, a council Śāriputra did not attend because he predeceased the Buddha by three months. Ānanda's role was oral preservation; Śāriputra's was doctrinal systematisation. Both were essential to how the early tradition transmitted itself, but through distinct channels.
Why he is in the lexicon
No item in the index is attributed to Śāriputra directly. The early Nikāyas, the Abhidhamma Piṭaka, and the Prajñāpāramitā corpus are absent from the current corpus. He is here for the same reason Ādi Śaṅkara and Papaji appear without items: the figure is upstream of several strands the index does carry. The vipassana lineage descends from the satipaṭṭhāna and analytical curricula his canonical role shaped. The Theravāda scholastic tradition reaches Buddhaghosa and the Visuddhimagga through him. The Mahāyāna emptiness teaching reaches Nāgārjuna and the Madhyamaka corpus through the Prajñāpāramitā sūtras the tradition addresses to him by name. The figure the canon presents as the Buddha's foremost analyst is also the named limit-case against which later traditions defined their deeper teachings.