Saurapurana 45.15

45.15

bahiścāhaṃ tathā cāntaḥ purastādahamavyayaḥ
jyotiścāhaṃ tamaścāhaṃ brahmaviṣṇumaheśvarāḥ

I am the outside, likewise the inside, in front, the imperishable; / I am light, and I am darkness, Brahmā, Viṣṇu, and Maheśvara;