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Rigveda
The oldest Vedic collection; Vishnu has five of its 1,028 hymns and appears as the three-striding friend of Indra; the Purusha Sukta (10.90) is in its latest layer.
Sources: Vishnu — Wikipedia; Purusha Sukta — Wikipedia; Hymns of the Rigveda (Griffith, 1896) — sacred-texts.com · see Rigveda's web