પાણી પીવું છણીને અને ગુરૂ કરવા જાણીને.

pāṇī pīvuṁ chaṇīnē anē gurū karavā jāṇīnē.

Literally: Drink water after straining it, and accept a guru after knowing him.
What it means: Exercise careful scrutiny before accepting anyone as a spiritual teacher, just as one filters drinking water.

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.