Bhagavad Gita · 4.35

यज्ज्ञात्वा न पुनर्मोहमेवं यास्यसि पाण्डव।येन भूतान्यशेषेण द्रक्ष्यस्यात्मन्यथो मयि॥

yaj jñātvā na punar moham evaṁ yāsyasi pāṇḍava yena bhūtāny aśheṣheṇa drakṣhyasy ātmany atho mayi

Having known this, O Pandava, you will never again fall into delusion. By this knowledge, you will see all beings without exception in the Self — and then in Me.

— Bhagavad Gita 4.35

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