Is there an English idiom that is the equivalent of the Hindi "Patthar par lakeer"?

Question

It literally translates to "a line drawn on a rock" and means "a statement that can never be proved wrong" or "an utterance that has to come true, come what may".

Answer 1

yeah it must be the "unchanged truth" he he he he

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Sameera

Answer 2

Jee haan, it is "Written in stone." Hope that helped.