Bhagavad Gita · 6.29

सर्वभूतस्थमात्मानं सर्वभूतानि चात्मनि।ईक्षते योगयुक्तात्मा सर्वत्र समदर्शनः॥

sarva-bhūta-stham ātmānaṁ sarva-bhūtāni chātmani īkṣhate yoga-yuktātmā sarvatra sama-darśhanaḥ

The one who is united in yoga sees the Self in all beings and all beings in the Self — seeing equally everywhere.

— Bhagavad Gita 6.29

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