Bhagavad Gītā Chapter 3, Verse 21: Krishna to Arjuna — Karma-Yoga

Bhagavad Gītā 3.21Chapter 3 · Karma-Yoga · Krishna → Arjuna · anuṣṭubh
यद् यदाचरति श्रेष्ठस् तत् तदेवेतरो जनः ।
स यत् प्रमाणं कुरुते लोकस् तदनुवर्तते ॥
yad yad ācarati śreṣṭhas tat tad evetaro janaḥ
sa yat← yad(218 verses)accusative neuter singular nounwhich, who (relative pronoun) pramāṇaṃ kurute lokas tad anuvartat← tad(305 verses)accusative neuter singular nounthat (distal demonstrative); also 3rd-person pronoune
spokensingle-voice recital; rendered via IndicF5 conditioned on a Sanskrit reference clip
meaning

Whatever a great person does, others do too; whatever standard that person sets, the world follows.