pūrva-taram

एवं ज्ञात्वा कृतं कर्म पूर्वैरपि मुमुक्षुभिः

pūrvaiḥ — of ancient times

Knowing this, those who sought freedom in earlier times did their work. So do your work as they did.

पूर्वाभ्यासेन तेनैव ह्रियते ह्यवशोऽपि सः

pūrva — past

Carried by that earlier practice, such a person is drawn on even without willing it. And even one who merely wishes to know of yoga goes beyond the letter of the scriptures.

तस्मात्त्वमुत्तिष्ठ यशो लभस्व जित्वा शत्रून् भुङ्क्ष्व राज्यं समृद्धम्

pūrvam — already

So stand up. Win honour. Conquer your enemies and enjoy a flourishing kingdom. By me they are already slain; be only the instrument, Arjuna.