One verse

Srimad Bhagavatam 3.6.33

3.6.33

पद्‍भ्यां भगवतो जज्ञे शुश्रूषा धर्मसिद्धये । तस्यां जात: पुरा शूद्रो यद्‌वृत्त्या तुष्यते हरि: ॥ ३३ ॥

padbhyam bhagavato jajne susrusa dharma-siddhaye tasyam jatah pura sudro yad-vrttya tusyate harih

padbhyam
from the legs
bhagavatah
of the Personality of Godhead
jajne
became manifested
susrusa
service
dharma
occupational duty
siddhaye
for the matter of
tasyam
in that
jatah
being generated
pura
formerly
sudrah
the servitors
yat-vrttya
the occupation by which
tusyate
becomes satisfied
harih
the Supreme Personality of Godhead.

Thereafter, service was manifested from the legs of the Personality of Godhead for the sake of perfecting the religious function. Situated on the legs are the sudras, who satisfy the Lord by service.