In the book titled "Second book of Sanskrit" there are verses appear in couple of chapters, the author of the Second book of Sanskrit says that the verses are addressing to a King named Krishna. Could anyone identity the name of the work and author of the same. 

Page 4 

तद्विद्विषां जरति चेतसि भोगतृष्णा ।

तेषां वपूंषि विपिनेषु च जारयन्ति।।

सहते शस्त्रसंपातं सहति श्रममाहवे etc

Any help is highly appreciated

Thanks and Regards

KP