Surya Siddhanta
तदण्डम् अभवद् धैमम् सर्वत्र तमसावृतम् । तत्रानिरुद्धः प्रथमम् व्यक्तीभूतः सनातनः॥
That water took the form of a golden egg, enveloped in darkness. Within this egg Sanatana Aniruddha (the unrestrained and everlasting one) first manifested Himself.
english translation