Bhagavad Gita 3.21 Chapter 3, Verse 21

यद्यदाचरति श्रेष्ठस्तत्तदेवेतरो जनः ।
स यत्प्रमाणं कुरुते लोकस्तदनुवर्तते ॥३.२१॥

yadyadācarati śreṣṭhastattadevetaro janaḥ
sa yatpramāṇaṃ kurute lokastadanuvartate

Meaning

Whatever a great person does, others follow. Whatever standard such a person sets, the world follows it.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 3.21 (Chapter 3, The Yoga of Action (Karma Yoga), Verse 21)