Bhagavad Gita 11.13

In that vision, Arjuna saw the universe, with its manifold shapes, all embraced in one, its Supreme Lord.

तत्रैकस्थं जगत्कृत्स्नं प्रविभक्तमनेकधा।
अपश्यद्देवदेवस्य शरीरे पाण्डवस्तदा॥

tatraikasthaṃ jagatkṛtsnaṃ pravibhaktamanekadhā|
apaśyaddevadevasya śarīre pāṇḍavastadā||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).