Shiva Purana
प्रकृतिस्त्वं पुमान्रुद्रस्त्वयि वीर्य्यं समाहितम् ॥ त्वन्नाभिपङ्कजाज्जातः पञ्च वक्त्रः पितामहः ॥ ४० ॥
You are Prakṛti and Rudra is Puruṣa. The semen is deposited in you. The five-faced Brahmā was born of your umbilical lotus.
english translation
prakRtistvaM pumAnrudrastvayi vIryyaM samAhitam ॥ tvannAbhipaGkajAjjAtaH paJca vaktraH pitAmahaH ॥ 40 ॥
hk transliteration by Sanscript