જેને ઘેર કાળી (ભેંસ) તેને નિત્ય દિવાળી.

jēnē ghēra kāḷī (bhēṁsa) tēnē nitya divāḷī.

Literally: In whose house there is a black one (buffalo), for them it is always Diwali.
What it means: Possessing a reliable source of livelihood or wealth brings constant celebration and prosperity.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) 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.