Shiva Purana
श्वेतवर्णा तदा सा गौर्द्रुतं श्यामा व्यदृश्यत ॥ अहो च दृश्यतां लोकाश्चुक्रुशुश्च परस्परम् ॥ ४९॥
The cow which had been white in colour turned black immediately. People cried to one another “O see O see.”
english translation
zvetavarNA tadA sA gaurdrutaM zyAmA vyadRzyata ॥ aho ca dRzyatAM lokAzcukruzuzca parasparam ॥ 49॥
hk transliteration by Sanscript