Surya Siddhanta
तस्मै वेदान् वरान् दत्त्वा सर्वलोकपितामहम् । प्रतिष्ठाप्याण्डमध्ये +अथ स्वयम् पर्येति भावयन्॥
Bestowing upon him (Brahmä) the scriptures (Vedas) as gifts, and establishing him within the egg as grandfather of all worlds, he (the sun) himself then revolves, creating existence.
english translation