હરદી જરદી ના તજે, ખટ રસ તજે ન આમ;

haradī jaradī nā tajē, khaṭa rasa tajē na āma;

Literally: Turmeric does not abandon its yellow color, nor does mango abandon its sourness.
What it means: Innate qualities and natural dispositions of things or people can never be changed.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.