holy Bhagwad-Geeta,

एवं ज्ञात्वा कृतं कर्म पूर्वैरपि मुमुक्षुभि: |
कुरु कर्मैव तस्मात्त्वं पूर्वै: पूर्वतरं कृतम् || 15||

BG 4.15 :Knowing this truth, even seekers of liberation in ancient times performed actions. Therefore, following the footsteps of those ancient sages, you too should perform your duty.