Bhagavatapurana 8.7.11

8.7.11

surāsurendrairbhujavīryavepitaṃ paribhramantaṃ girimaṅga pṛṣṭhataḥ /
bibhrat tadāvartanamādikacchapo mene 'ṅgakaṇḍūyanamaprameyaḥ //

10. O dear son, supporting on His back the mountain that was being turned round and round and shaken by the dint of arms of great gods and the Asuras, the First Tortoise, the supreme Deity of

immeasurable powers, regarded the turning as a gentle, pleasurable scratching of His back.