Synonyms:

anta-vantah–perishable; ime–all these; dehah–material bodies; nityasya–eternal in existence; uktah–it is so said; saririnah–the embodied soul; anasinah–never to be destroyed; aprameyasya–immeasurable; tasmat–therefore; yudhyasva–fight; bharata–O descendant of Bharata.

Translation:

Only the material body of the indestructible, immeasurable and eternal living entity is subject to destruction; therefore, fight, O descendant of Bharata.