Luke 20:3

Israeli Authorized Version

And he answered and said unto them, I will also ask you one thing; and answer me:

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Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.

And if I also ask you, ye will not answer me, nor let me go.

And spake unto him, saying, Tell us, by what authority doest thou these things? or who is he that gave thee this authority?

The immersion of Yochanan, was it from heaven, or of men?