Shiva Purana
मथ्यमानेऽमृते पूर्वं क्षीराब्धेस्सुरदानवैः ॥ अग्नेः समुत्थितं तस्माद्विषं कालानलप्रभम् ॥ ३ ॥
When the churning of the milk ocean started as the gods and demons wanted nectar, poison blazing as the fire of dissolution came out at first.
english translation
mathyamAne'mRte pUrvaM kSIrAbdhessuradAnavaiH ॥ agneH samutthitaM tasmAdviSaM kAlAnalaprabham ॥ 3 ॥
hk transliteration by Sanscript