Shiva Purana
बृहत्त्वाद्बृंहणत्वाच्च ब्रह्माहं ब्रह्मकेशवौ । समत्वाद्व्यापकत्वाच्च तथैवात्माहमर्भकौ ३७ ।
O Brahmā and Viṣṇu, I am Brahman because of Bṛhatva (huge size) and Bṛṃhaṇatva (causing to grow). O children, similarly I am Ātman due to Samatva (equality) and Vyāpakatva (Pervasiveness).
english translation
bRhattvAdbRMhaNatvAcca brahmAhaM brahmakezavau । samatvAdvyApakatvAcca tathaivAtmAhamarbhakau 37 ।
hk transliteration by Sanscript