કાગડાની ગાં—માંથી ગંગાજળ નીતરે નહીં.

kāgaḍānī gāṁ—māṁthī gaṁgājaḷa nītarē nahīṁ.

Literally: Ganges water does not drip from a crow's anus.
What it means: You cannot expect something pure or valuable from a corrupt source.
The English proverb Shah set beside it: ઇસ્મે મુત નહીં હે.

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.