Shiva Purana
सुप्रसाद्य गिरीशं तं तदाज्ञप्ताः सुरासुराः ॥ बलादुत्पाटयामासुर्नेतुकामाः पयोऽर्णवम् ॥ १० ॥
After propitiating Śiva and after obtaining his consent they tried to uproot the Mandara in their desire to take it to the milk-ocean.
english translation
suprasAdya girIzaM taM tadAjJaptAH surAsurAH ॥ balAdutpATayAmAsurnetukAmAH payo'rNavam ॥ 10 ॥
hk transliteration by Sanscript