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

yadi hyahaṁ na varteyaṁ jātu karmaṇyatandritaḥ mama vartmānuvartante manuṣhyāḥ pārtha sarvaśhaḥ

For if I mingled not ever in action unwearied, men all around would follow My path, O son of Prithâ.

In plain words: Krishna says that if he ever stopped working, people everywhere would copy him. They watch what he does and follow it.