|Canto 1: Creation||Chapter 4: The Appearance of Śrī Nārada|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 1.4.20
vedāś catvāra uddhṛtāḥ
pañcamo veda ucyate
ṛg-yajuḥ-sāma-atharva-ākhyāḥ — the names of the four Vedas; vedāḥ — the Vedas; catvāraḥ — four; uddhṛtāḥ — made into separate parts; itihāsa — historical records (Mahābhārata); purāṇam ca — and the Purāṇas; pañcamaḥ — the fifth; vedaḥ — the original source of knowledge; ucyate — is said to be.
The four divisions of the original sources of knowledge [the Vedas] were made separately. But the historical facts and authentic stories mentioned in the Purāṇas are called the fifth Veda.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness