The Vedas, earliest among scriptural compositions of ancient India, are regarded as divinely revealed, eternal wisdom. The four Vedas are, in order of antiquity, the Rig Veda (“Knowledge of the Hymns”), the Yajur Veda (“Knowledge of the Sacrificial Formulas”), the Sama Veda (“Knowledge of the Songs of Praise”), and the Atharva Veda (“The Knowledge of [Sage] Atharvan”).
Rig Veda, 1:50, verses 1, 4, and 10; Raimundo Panikkar (trans.), The Vedic Experience: Mantramanjari (Los Angeles: University of California Press, 1977), pp. 294–95.