અજાણ્યાનો ગુન્હો માફ.

ajāṇyānō gunhō māpha.

Literally: The fault of a stranger is forgiven.
What it means: People are more lenient toward the mistakes of those they do not know well.

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.