तत्रैकस्थं जगत्कृत्स्नं प्रविभक्तमनेकधा। अपश्यद्देवदेवस्य शरीरे पाण्डवस्तदा ॥

tatraika-sthaṁ jagat kṛitsnaṁ pravibhaktam anekadhā apaśhyad deva-devasya śharīre pāṇḍavas tadā

There Pândava beheld the whole universe, divided into manifold parts, standing in one in the body of the Deity of Deities.

In plain words: Arjuna (the Pandava, son of Pandu) saw the whole universe, with all its many different parts, gathered together in the body of Krishna, the God above all gods.