Gregory the Great — as excerpted in the Catena Aurea on John 20:10-18

“(Hom. xxv.) The Evangelist does not add what she did upon recognising Him, but we know from what our Lord said to her: Jesus saith unto her, Touch Me not. Mary then had tried to embrace His feet, but was not allowed. Why not? The reason follows: For I am not yet ascended to My Father.”