What and if, &c.? The Apodosis which is wanting (by Ellipsis) must be supplied thus: "If" (as in John 6:51) therefore ye should behold the Son of man ascending up where He was before [will ye be offended then]? "
ascend. ascending.
Related Commentaries of John 6:62
John 6:62
62 What and if ye shall see the Son of man ascend up where he was before?