વાવીએ કડવી તુંબડી, ઉતરે તુંબ હજાર;

vāvīē kaḍavī tuṁbaḍī, utarē tuṁba hajāra;

Literally: If you sow a bitter gourd, a thousand gourds will grow.
What it means: A single bad deed or evil thought multiplies and yields abundant bitter consequences.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · 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.