Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 14
Sanskrit:
तानि चैकैकश: स्रष्टुमसमर्थानि भौतिकम् ।संहत्य दैवयोगेन हैममण्डमवासृजन् ॥ १४ ॥
ITRANS:
tāni caikaikaśaḥ sraṣṭumasamarthāni bhautikamsaṁhatya daiva-yogenahaimam aṇḍam avāsṛjan
Translation:
Separately unable to produce the material universe, they combined with the help of the energy of the Supreme Lord and were able to produce a shining egg.