Tertullian

“ For when a man is rapt in the Spirit, especially when he beholds the glory of God, or when God speaks through him, he necessarily loses his sensation, [17] because he is overshadowed with the power of God,—a point concerning which there is a question between us and the carnally-minded. [18] Now, it is no difficult matter to prove the rapture [19] of Peter. For how could he have known Moses and Elias, except (by being) in the Spirit? People could not have had their images, or statues, or likenesses; for that the law forbade. How, if it were not that he had seen them in the Spirit? ”

“ For when Moses desired to see the Lord, saying, “If therefore I have found grace in Thy sight, manifest Thyself to me, that I may see Thee distinctly,” [50] the sight which he desired to have was of that condition which he was to assume as man, and which as a prophet he knew was to occur. Respecting the face of God, however, he had already heard, “No man shall see me, and live.” “This thing,” said He, “which thou hast spoken, will I do unto thee.” Then Moses said, “Show me Thy glory.” And the Lord, with like reference to the future, replied, “I will pass before thee in my glory,” etc. ”

“ Marcion Inconsistent in Associating with Christ in Glory Two Such Eminent Servants of the Creator as Moses and Elijah. St. Peter’s Ignorance Accounted for on Montanist Principle.
You ought to be very much ashamed of yourself on this account too, for permitting him to appear on the retired mountain in the company of Moses and Elias, [1] whom he had come to destroy. This, to be sure, [2] was what he wished to be understood as the meaning of that voice from heaven: “This is my beloved Son, hear Him” [3] —Him, that is, not Moses or Elias any longer. ”