Strong’s Greek
G4220 — poteron
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πότερον
poteron — pronounced pot'-er-on
neuter of a comparative of the base of 4226; interrogative as adverb, which (of two), i.e. is it this or that:--whether. see GREEK for 4226
1 occurrence in the KJV.
John 7:17
If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.