Nadabindu Upanishad Verse 26

Sanskrit

अज्ञानं चेति वेदान्तैस्तस्मिन्नष्टे क्व विश्वता । यथा रज्जुं परित्यज्य सर्पं गृह्णाति वै भ्रमात् ॥ २६॥

K. Narayanasvami Aiyar's Translation

As a person through illusion mistakes a rope for a serpent, so the fool not knowing Satya (the eternal truth) sees the world (to be true.)

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Reference: Nadabindu Upanishad