ANSWER: It is evidently an elliptical quotation from Deut. 30:12, "Who shall go for us to heaven, and bring it (God's command) unto us," etc.; also Prov. 30:3, 4, "Neither have I the knowledge of the Holy One, who hath ascended up into heaven, and descended?" Christ omitted the last clause of these texts, the return from heaven with a message for men. The context very clearly proves that this is the correct explanation. He is asserting his own sole competence to reveal heavenly truth, because he, the Son of man, is the only human teacher who has been in heaven and has brought down truths absolute and eternal. (2) Elijah's personality resides in his spirit. This certainly is in heaven. But on the mount of transfiguration he appeared in a visible form. We are taught in I Cor. 15:51, that when the dead are raised the living believers "will be changed in a moment." It is not unreasonable to suppose that Enoch and Elijah were the first fruits of this change of the living "in the twinkling of an eye."
— Steele's Answers pp. 113, 114.