Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 8
Sanskrit:
मन्यमानो हतं व्याघ्रं पृषध्र: परवीरहा ।अद्राक्षीत् स्वहतां बभ्रुं व्युष्टायां निशि दु:खित: ॥ ८ ॥
ITRANS:
manyamāno hataṁ vyāghraṁpṛṣadhraḥ para-vīra-hāadrākṣīt sva-hatāṁ babhruṁvyuṣṭāyāṁ niśi duḥkhitaḥ
Translation:
In the morning, when Pṛṣadhra, who was quite able to subdue his enemy, saw that he had killed the cow although at night he thought he had killed the tiger, he was very unhappy.