લક્ષ્મી ચાલે કરવા આવે, ત્યારે કહેશે મ્હોં ધોઈ આવું.

lakṣmī cālē karavā āvē, tyārē kahēśē mhōṁ dhōī āvuṁ.

Literally: When fortune comes to mark the forehead, one says 'let me wash my face first'.
What it means: Criticizes foolish people who stall or make silly excuses when a great opportunity presents itself.

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.