πότερον G4220
póteron · pot'-er-on · Conjunction
neuter of a comparative of the base of ποῦ; interrogative as adverb, which (of two), i.e. is it this or that:--whether.
1 Occurrence in the King James Bible
John 7:17If any man will do his will, he shall know of the doctrine, whether it be of God, or whether I speak of myself.