One verse

Srimad Bhagavatam 4.18.27

4.18.27

एवं पृथ्वादय: पृथ्वीमन्नादा: स्वन्नमात्मन: । दोहवत्सादिभेदेन क्षीरभेदं कुरूद्वह ॥ २७ ॥

evam prthv-adayah prthvim annadah svannam atmanah doha-vatsadi-bhedena ksira-bhedam kurudvaha

evam
thus
prthu-adayah
King Prthu and others
prthvim
the earth
anna-adah
all living entities desiring food
su-annam
their desired foodstuff
atmanah
for self-preservation
doha
for milking
vatsa-adi
by calves, pots and milkers
bhedena
different
ksira
milk
bhedam
different
kuru-udvaha
O chief of the Kurus.

My dear Vidura, chief of the Kurus, in this way King Prthu and all the others who subsist on food created different types of calves and milked out their respective eatables. Thus they received their various foodstuffs, which were symbolized as milk.