Ramayana
तस्य तं स्वरमाज्ञाय क्षुधार्तस्य द्विजस्य वै । अन्वगात्पृष्ठतः सा गौर्गच्छन्तं पावकोपमम् ॥ 7-53-13 ॥
Recognizing the voice of that hunger-stricken brahmin, who was like blazing fire, the cow followed behind him as he went.
english translation