Śrī Pāñcarātram — The Āgamic Foundation of Śrī Vaiṣṇava Worship
Śrī Pāñcarātram (Sanskrit: pañca = five + rātra = night; traditionally 'the teaching given over five nights' or 'the five-fold protection') is the collective name for the Pāñcarātra Āgamas — the vast body of Vaiṣṇava scriptural texts dealing with temple worship, image consecration (pratiṣṭhā), initiation rites (saṃskāras), the theology of Bhagavān's emanation (vyūha doctrine), and the liturgy of the Śrī Vaiṣṇava practitioner.
The Pāñcarātra Corpus: Hundreds of Āgamas belong to the Pāñcarātra tradition; among the most important are the Sātvata Saṃhitā, Pauṣkara Saṃhitā, Jayākhya Saṃhitā, and the Ahirbudhnya Saṃhitā. These texts detail the construction and consecration of Viṣṇu temples, the qualifications and duties of priests (arcakas), the liturgical sequences for daily worship (nityā-krama), and the vyūha doctrine — the fourfold emanation of Bhagavān through Vāsudeva, Saṃkarṣaṇa, Pradyumna, and Aniruddha.
Authority in Śrī Vaiṣṇava Theology: The authority of the Pāñcarātra Āgamas was a matter of intense theological debate. Mīmāṃsakas and some Advaitins questioned their validity since they are not Vedic in form. Yāmunāchārya composed the Āgama-prāmāṇyam (Proof of the Āgamas' Validity) in their defense; Rāmānuja extended this defense at length in the Śrī Bhāṣya, arguing that Pāñcarātra derives from the Vedic Puruṣa Nārāyaṇa himself and is therefore equally authoritative with the Vedas.
Practical Significance: For the Śrī Vaiṣṇava practitioner, Pāñcarātra is the living operative scripture. Temple arcakas are trained according to Pāñcarātra manuals; the pañca-saṃskāra (five sacraments) is Pāñcarātra in structure; and the daily worship offered in divyadēśams follows Pāñcarātra liturgical sequences. The entire architecture of Śrī Vaiṣṇava ritual life flows from this Āgamic foundation.