જ્યાં મંદવાડ ત્યાં ગંદવાડ.

jyāṁ maṁdavāḍa tyāṁ gaṁdavāḍa.

Literally: Where there is sickness, there is filth.
What it means: Disease and unsanitary conditions always accompany one another.

Also said as

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.