Cyril of Alexandria

By day He was in Jerusalem, but when the darkness of night came on He held converse with His disciples on the mount of Olives; as it is added, And his disciples followed.

Catena Aurea by Aquinas ↗

Theophylact of Ohrid

After supper, the Lord does not give Himself over to idleness, pleasures, and sleep, but teaches and prays, giving us a model and example in this. Therefore, woe to those who after suppers turn to the shameful deeds of fornication. Having taught this to the disciples, the Lord ascends the Mount of Olives to pray. He loved to do this in private, and therefore withdraws even from the disciples. However, He takes disciples with Him, but not all—only those three who had seen His glory on the mountain (Luke 9:28).

Commentary on Luke ↗

Bede

And he went out and went, according to custom, to the Mount of Olives. And his disciples followed him. The Lord, about to be betrayed by a disciple, goes to the usual place of retreat where he could be most easily found. Where, then, are those who argue that he feared death, and was unwillingly crucified? …

On the Gospel of Luke ↗

Bonaventure

And going out, he went according to his custom, etc. After describing the machination of the betrayer and the institution of the Sacrament of the altar and the instruction of the disciples, the Evangelist here describes the prayer of Christ the man to God; and this with respect to the sevenfold condition which ought to be in prayer. For it ought to be secret, solicitous, devout, discreet, vigorous, anxious, and circumspect. …

Commentary on Luke, Chapter 22 ↗