Bhagavad Gita · 13.28

समं सर्वेषु भूतेषु तिष्ठन्तं परमेश्वरम्।विनश्यत्स्वविनश्यन्तं यः पश्यति स पश्यति॥

samaṁ sarveṣhu bhūteṣhu tiṣhṭhantaṁ parameśhvaram vinaśhyatsv avinaśhyantaṁ yaḥ paśhyati sa paśhyati

One who sees the Supreme Lord dwelling equally in all beings, the imperishable within the perishable — that person truly sees.

— Bhagavad Gita 13.28

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