Shiva Purana
विराड्ढिरण्यगर्भात्मा कैश्चिदीशो निगद्यते ॥ हिरण्यगर्भो लोकानां हेतुर्विश्वात्मको विराट् ॥ २२ ॥
By some he is mentioned as the Ātman of Virāṭ and Hiraṇyagarbha. Hiraṇyagarbha is the cause of the worlds, Brahmā etc., Virāṭ is the cosmic form or being.
english translation
virADDhiraNyagarbhAtmA kaizcidIzo nigadyate ॥ hiraNyagarbho lokAnAM heturvizvAtmako virAT ॥ 22 ॥
hk transliteration by Sanscript