બાલસૈં ખેલ નહીં, બડેસૈં વેર નહીં.

bālasaiṁ khēla nahīṁ, baḍēsaiṁ vēra nahīṁ.

Literally: No playing with children, no enmity with the great.
What it means: One should avoid trivializing children and avoid making enemies of powerful people.

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.