Shiva Purana
ततस्सुरासुरगणा रज्जुं कृत्वा च वासुकिम् ॥ रत्नान्यादातुकामास्ते ममंथुः क्षीरसागरम् ॥ १५ ॥
Then both the gods and the Asuras made Vāsuki the churning rope. Desirous of taking the excellent articles they churned the milk-ocean.
english translation
tatassurAsuragaNA rajjuM kRtvA ca vAsukim ॥ ratnAnyAdAtukAmAste mamaMthuH kSIrasAgaram ॥ 15 ॥
hk transliteration by Sanscript