Chapter 4 · verse 15 · gita.yoga.org

Bhagavad Gita 4.15

एवं ज्ञात्वा कृतं कर्म पूर्वैरपि मुमुक्षुभिः। कुरु कर्मैव तस्मात्त्वं पूर्वैः पूर्वतरं कृतम्

Having known this, the ancient seekers of freedom also performed action; therefore, do thou also perform action, as the ancients did in days of yore.