Bhagavad Gita · 13.30

प्रकृत्यैव च कर्माणि क्रियमाणानि सर्वशः।यः पश्यति तथात्मानमकर्तारं स पश्यति॥

prakṛtyaiva cha karmāṇi kriyamāṇāni sarvaśhaḥ yaḥ paśhyati tathātmānam akartāraṁ sa paśhyati

One who sees that all actions are performed entirely by prakriti (material nature) and that the Self is the non-doer — that person truly sees.

— Bhagavad Gita 13.30

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)