જમાન દાળો, તે ભવ દાળો.

jamāna dāḷō, tē bhava dāḷō.

Literally: A son-in-law's day is a lifetime's day.
What it means: A son-in-law must always be treated with formal respect, regardless of his stupidity or shortcomings.
The English proverb Shah set beside it: A son-in-law is a son-in-law, even if he is a fool.

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.