SB 12.11.50

evaṁ hy anādi-nidhano
bhagavān harir īśvaraḥ
kalpe kalpe svam ātmānaṁ
vyūhya lokān avaty ajaḥ

evam - thus; hi - indeed; anādi - without beginning; nidhanaḥ - or end; bhagavān - the Personality of Godhead; hariḥ - Lord Hari; īśvaraḥ - the supreme controller; kalpe kalpe - in each day of Brahmā; svam ātmānam - Himself; vyūhya - expanding into various forms; lokān - the worlds; avati - protects; ajaḥ - the unborn Lord.

Text

For the protection of all the worlds, the Supreme Personality of Godhead Hari, who is unborn and without beginning or end, thus expands Himself during each day of Brahmā into these specific categories of His personal representations.

Purport

Thus end the purports of the humble servants of His Divine Grace A.C. Bhaktivedanta Swami Prabhupāda to the Twelfth Canto, Eleventh Chapter, of the Śrīmad-Bhāgavatam, entitled “Summary Description of the Mahāpuruṣa.”

Srimad Bhagavatam. Canto 12: The Age of Deterioration

Chapter 11: Summary Description of the Mahapurusha. Text 50

For the protection of all the worlds, the Supreme Personality of Godhead Hari, who is unborn and without beginning or end, thus expands Himself during each day of Brahmā into these specific categories of His personal representations.