Skandapurana 1.3.7.60

1.3.7.60

baliḥ pravartitastena śakreṇa surasūdanaḥ..
uvāca śakraṃ tvaritaḥ kenedaṃ mathanaṃ bhavet.. 9.60 ..

Bali, the slayer of gods, being prompted by that Śakra, / promptly said to Śakra: “By what means can this churning take place?”