Bhagavatapurana 10.69.14.p2

10.69.14.p2

tasyāvanijya caraṇau tad-apaḥ sva-mūrdhnā $ bibhraj jagad-gurutamo 'pi satāṃ patir hi &

Having washed his feet, He placed that water upon His own head, though He is the supreme spiritual teacher of the universe and the Lord of virtuous devotees;