Shiva Purana
आधारशक्त्यैव धृतः कालाग्निरयमूर्ध्वगः ॥ तथैव निम्नगः सोमश्शिवशक्तिपदास्पदः ॥ ११ ॥
The Kālāgni supported by Ādhāra Śakti proceeds upwards. Similarly Soma having its region in Śiva-Śakti flows downwards.
english translation
AdhArazaktyaiva dhRtaH kAlAgnirayamUrdhvagaH ॥ tathaiva nimnagaH somazzivazaktipadAspadaH ॥ 11 ॥
hk transliteration by Sanscript