નાગર ખસ્યા, કભુ ન બોલે સચ્ચા; બોલે સચ્ચા તો ગુરૂ કુચ્ચા.

nāgara khasyā, kabhu na bōlē saccā; bōlē saccā tō gurū kuccā.

Literally: If a Nagar strays, he never speaks truth; if he speaks truth, his guru is false.
What it means: Said as a derogatory stereotype accusing Nagars of being incorrigibly sly and untruthful when cornered.

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.