Theophylact of Ohrid

He led them out to Bethany; we think that this happened on the very fortieth day (from the resurrection). For what they speak of briefly, that (you should understand) takes place over the course of many days, as Luke himself also says in the Acts (Acts 1:3), that the Lord appeared to the disciples over the course of forty days, for He often appeared to them and often withdrew from them. …

Commentary on Luke ↗

Augustine of Hippo

You heard what came to our ears just now from the Gospel: "Lifting up his hands, he blessed them. And it happened, while he was blessing them he withdrew from them, and was carried up to heaven." Who was carried up to heaven? The Lord Christ was. Who is the Lord Christ? He is the Lord Jesus. What is this? Are you going to separate the human from the divine and make one person of God, another of the man, so that there is no longer a trinity of three but a quaternary of four? …

Sermon 242.6 ↗

Bede

"Then he led them out to Bethany, and lifting up his hands, he blessed them." Our Redeemer appeared in the flesh to take away sins, remove what humans deserved because of the first curse, and grant believers an inheritance of everlasting blessing. He rightly concluded all that he did in the world with words of blessing. …

Homilies on the Gospels 11.15 ↗

Bonaventure

Thirdly, as to the ascension of Christ, he adds: And he led them out to Bethany. This was not then, but on the fortieth day. This Bethany, moreover, is on the Mount of Olivet: whence above in chapter 19: "When he had drawn near to Bethphage and Bethany, at the Mount of Olivet." Now Bethany is interpreted as house of obedience, because through obedience one is placed on the mount that is Christ and is blessed by Christ and ascends into heaven. …

Commentary on Luke, Chapter 24 ↗