Bhagavad Gita 3.23

Were I not to act without ceasing, O prince, people would be inclined to do the same.

यदि ह्यहं न वर्तेयं जातु कर्मण्यतन्द्रितः।
मम वर्त्मानुवर्तन्ते मनुष्याः पार्थ सर्वशः॥

yadi hyahaṃ na varteyaṃ jātu karmaṇyatandritaḥ|
mama vartmānuvartante manuṣyāḥ pārtha sarvaśaḥ||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).