સુખમેં પીછે પડ રહે, દુઃખમેં આગું હોય.

sukhamēṁ pīchē paḍa rahē, duḥkhamēṁ āguṁ hōya.

Literally: Who stays behind in times of happiness, and comes forward in times of misery.
What it means: A true friend remains in the background during your prosperity but stands at the forefront to help during your adversity.

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.