Here is where I get my proof that Christ actually did ascend to heaven for the first time immediately after speaking with Mary in
John 20:17.
It is found in
Psalms 110:3 in the LXX. This entire Psalm is a Messianic one, describing how God installed Christ as our high priest after the order of Melchizedek on His resurrection day, and the results of that. In
Acts 2:33-36, Peter agreed with that interpretation of
Psalms 110:1 as applying to
the day of Christ's resurrection.
Therefore, since this Psalms 110 context is connected prophetically with Christ's resurrection day, we read verse
Psalms 110:3 LXX with that understanding.
Psalms 110:3 LXX says, "With thee is dominion in the day of thy power" (This is the "dominion", glory, and the high priesthood of the kingdom given to the newly-resurrected Son of Man in
Daniel 7:13-14) "in the splendours of thy saints:" (those
Matthew 27:52-53 saints which Jesus Christ resurrected that same day). "
I HAVE BEGOTTEN THEE FROM THE WOMB
BEFORE THE MORNING." Something was "born" or "begotten" in heaven for the first time
before that morning dawned which had never existed there before.
God prophetically mentions that particular day in which Jesus Christ was "BEGOTTEN" in
Psalms 2:7, saying, "Thou art my Son; this day have I BEGOTTEN thee." Christ became the "First-born" and the "First-begotten of the dead"
by being the very first bodily-resurrected human body to ascend to God in heaven and present Himself before the Ancient of Days in that form. And according to
Psalms 110:3 in the LXX, Jesus Christ was "begotten" in this manner by God "
before the morning".
Now, we are told that Mary came to Christ's tomb "WHEN IT WAS YET DARK" in
John 20:1. Seeing the stone rolled back, she ran to tell Peter and the beloved disciple. Running back with them, she remained weeping at the tomb once they had left. This is when she saw the two messengers in white, and then Jesus Himself. He then told her not to touch Him, because He had not yet ascended to the Father. Her mission was to go tell the disciples that "I ascend unto my Father, and your Father, and to my God, and your God", which Jesus did as soon as she had left (
John 20:17).
This before-dawn first ascension of Christ was the time ("while it was yet dark" - "before the morning") when Christ as the bodily-resurrected Son of Man was "brought near before the Ancient of Days". He offered Himself "without spot to God", and as our "Great High Priest" sprinkled His life-blood on heaven's mercy seat on our behalf. God accepted this offering, which became the perpetual covering for our sins, imputing Christ's righteousness to us as being "accepted in the beloved".
This is why there is a distinct difference between the body of Christ which could
not be handled yet (in
John 20:17), when compared to the body of Christ being seen later that morning when they
could hold Him by the feet (in
Matthew 28:9). Christ's body had to remain ritually pure before He entered into heaven's temple as a spotless high priest offering his blood sacrifice.