John Lightfoot on John 20:17

[Touch me not; for I am not yet ascended, &c.] These words relate to what he had spoken formerly about sending the Comforter, and that he would not leave them comfortless, &c. And this probably Mary Magdalene's mind was intent upon when she fell at his feet and would have embraced them. But he, "I must first ascend to my Father before I can bestow those things upon you which I have promised: do not therefore touch me and detain me upon any expectation of that kind; but wait for my ascension rather; and go and tell the same things to my brethren for their encouragement."