Garudapurana 3.12.17

3.12.17

tattvecchavaḥ pravijānanti nityaṃ vede sūktānkvāpyanuktāṃśca sarvān /
ādau jānantyatra vedā murāre ṛgādayaḥ suṣṭhu catvāra eva //

Those desirous of truth always fully know all that is well said in the Veda and also what is nowhere uttered. / First, the four Vedas, beginning with the Ṛgveda, truly know here, O Murāri.