Bhagavad Gita 3.21

For whatever a great man does, others imitate; people conform to the standard he has set.

यद्यदाचरति श्रेष्ठस्तत्तदेवेतरो जनः।
स यत्प्रमाणं कुरुते लोकस्तदनुवर्तते॥

yadyadācarati śreṣṭhastattadevetaro janaḥ|
sa yatpramāṇaṃ kurute lokastadanuvartate||

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