Bhagavatapurana 5.22.3

5.22.3

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sa eṣa bhagavān ādi-puruṣa eva sākṣān nārāyaṇo lokānāṃ svastaya ātmānaṃ trayīmayaṃ karma-viśuddhi-nimittaṃ kavibhir api ca vedena vijijñāsyamāno dvādaśadhā vibhajya ṣaṭsu vasantādiṣv ṛtuṣu yathopa-joṣam ṛtu-guṇān vidadhāti //

3. The very same glorious Narayana who is the first cause and supreme Person and the subject of the three Vedas, who is the cause of the world's well-being, as well as the purification of all the world's activity and who is being enquired into even by men of wisdom with the help of the Vedas, exhibits Himself in twelve forms and infuses into the six seasons commencing with Vasanta their characteristics to make them severally enjoyable.