Bhagavatapurana 2.7.13

2.7.13

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13. When the hosts of the Devas and Danavas churned the sea of milk for extracting nectar, the First (Supreme) Deity, in the form of a tortoise, bore on His back the mount (Mandara) [which was the churning rod]; and the agitation of the mountain was to Him as scratching, in consequence of which He seemed to have the pleasure of a nap; [when it seemed to Him an hour of leisure or pleasure to dose away, the itching sensation being scratched away by the turning of the churn.]