Shiva Purana
तत्पपुः केवलन्देवा नासुराः कृपया हरेः ॥ ततो बभूव सुमहद्रत्नं तेषां मिथोऽकदम् ॥ १० ॥
Not the Asuras, but the gods drank the nectar, thanks to the favour of Viṣṇu. Then a great battle ensued between them inflicting pain on both.
english translation
tatpapuH kevalandevA nAsurAH kRpayA hareH ॥ tato babhUva sumahadratnaM teSAM mitho'kadam ॥ 10 ॥
hk transliteration by Sanscript