Or thou have a house of gold or thou ascend into heaven; and we will not believe in thy ascension until thou send down to us a book that we can read. Say, Holy is my Lord! I am not but a man sent as a messenger. (17:94)
This verse discounts the possibility that mortals ascend to the heavens and bring guidance from there. When the disbelievers made various demands of the Holy Prophet saw, one being that he should ascend to the heavens and bring a book therefrom, he is told to respond that since his claim is no more than that of a mortal and a prophet, hence the demand is absurd. ‘Holy is my Lord,’ meaning, Allah is far above such absurdities.
Those Muslims who believe in Jesus to have physically ascended to the heavens, in fact, help the case of Christians. If Jesus has indeed ascended to the heavens and will return some day, then this verse is sufficient to prove his supra-mortal status, which is exactly the Christian claim.