Bhagavad Gita 3.21

यद्यदाचरति श्रेष्ठस्तत्तदेवेतरो जनः।स यत्प्रमाणं कुरुते लोकस्तदनुवर्तते ॥३.२१॥

yadyadācarati śreṣṭhastattadevetaro janaḥsa yatpramāṇaṃ kurute lokastadanuvartate

Whatever a great man does, others also do; whatever he establishes as the standard, the world follows.

गीता