2 Peter 1:18

And this voice which came from heaven we heard More accurately, as better expressing the force of the special word used here as in the previous verse, And this voice borne from heaven we heard.… The "we" is emphatic, as giving prominence to the fact of the personal testimony of the Apostle and his two brother-disciples.

when we were with him in the holy mount It has been urged by some critics that the description of the Mount of the Transfiguration by the term which in Old Testament language was commonly applied to Zion (Psalms 2:6) indicates the phraseology of a later age than that of the Apostles. It is obvious, however, in answer, that the scene of the manifestation of the Divineglory of which he speaks could not appear as other than "holy ground" holy as Horeb had been of old (Exodus 3:5; Acts 7:33) to the Apostle who had been there. Comp. Joshua 5:15. Whether, as the Gospel narrative indicates, it was on the heights of Hermon (Matthew 16:13), or, as later tradition reported, on Mount Tabor, it would remain for ever as a consecrated spot in the Apostle's memory. It may, perhaps, be inferred from the tone in which he thus speaks of it, that he assumes that his readers had already some knowledge of the fact referred to.