O Lord, during the time of maintenance You manifest several incarnations, all with transcendental bodies, beyond the material modes of nature. When You appear in this way, You bestow all good fortune upon the living entities by teaching them to perform Vedic activities such as ritualistic ceremonies, mystic yoga, austerities, penances, and ultimately samādhi, ecstatic absorption in thoughts of You. Thus You are worshiped by the Vedic principles.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सत्त्वं विशुद्धं श्रयते भवान् स्थितौ शरीरिणां श्रेय उपायनं वपुः । वेदक्रियायोगतपःसमाधिभि- स्तवार्हणं येन जनः समीहते
sattvaṃ viśuddhaṃ śrayate bhavān sthitau śarīriṇāṃ śreya upāyanaṃ vapuḥ | vedakriyāyogatapaḥsamādhibhi- stavārhaṇaṃ yena janaḥ samīhate
SB 10.2.34