You can't judge a book by its cover
kɪtaːb koː ʊskeː kʌʋəɾ seː mʌt ãkẽː
In Hindi किताब को उसके कवर से मत आंकें
This proverb is used in Hindi-speaking cultures to advise against judging based on appearances.
Example
"किताब को उसके कवर से मत आंकें; यह दिलचस्प हो सकता है।"