The Lord very easily lifted the mountain with one hand and placed it on the back of Garuḍa. Then, He too got on the back of Garuḍa and went to the Ocean of Milk, surrounded by the demigods and demons.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
गिरिं चारोप्य गरुडे हस्तेनैकेन लीलया । आरुह्य प्रययावब्धिं सुरासुरगणैर्वृतः
giriṃ cāropya garuḍe hastenaikena līlayā | āruhya prayayāvabdhiṃ surāsuragaṇairvṛtaḥ
SB 8.6.38