Shiva Purana
मन्दरं चैव मन्थानं रज्जुं कुरुत वासुकिम् ॥ मिथस्सर्वे मिलित्वा तु मंथनं कुरुतादरात् ॥ ७ ॥
Make Mandara your churning rod and Vāsuki your churning rope. Unitedly you carry on the churning with firm devotion.
english translation
mandaraM caiva manthAnaM rajjuM kuruta vAsukim ॥ mithassarve militvA tu maMthanaM kurutAdarAt ॥ 7 ॥
hk transliteration by Sanscript