Shiva Purana
अग्निरूर्ध्वं ज्वलत्येष यावत्सौम्यं परामृतम् ॥ यावदग्न्यास्पदं सौम्यममृतं च स्रवत्यधः ॥ ९ ॥
The Agni blazes upwards as far as the great Amṛta of Soma. The Amṛta of Soma flows as far as the support of Agni.
english translation
agnirUrdhvaM jvalatyeSa yAvatsaumyaM parAmRtam ॥ yAvadagnyAspadaM saumyamamRtaM ca sravatyadhaH ॥ 9 ॥
hk transliteration by Sanscript