ધગધગતા કોયલા હાથ બાળે, ઠારેલા હાથ કાળા કરે.

dhagadhagatā kōyalā hātha bāḷē, ṭhārēlā hātha kāḷā karē.

Literally: Glowing embers burn the hand, cooled ones blacken it.
What it means: Association with wicked people causes harm whether they are active or quiet.

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.