leopard cannot change its spots, a
Idioms
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Also, the tiger cannot change its stripes. One can't change one's essential nature. For example, He's a conservative, no matter what he says; the leopard cannot change its spots. These metaphoric expressions both originated in an ancient Greek proverb that appears in the Bible (Jeremiah 13:23): “Can the Ethiopian change his skin, or the leopard his spots?” It was first recorded in English in 1546.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.