Cyril of Alexandria

By means of the things of our present life He describes spiritual things. For they exercise a high privilege with earthly kings, who sit at their table as guests. So then by man's estimation He shows who shall be rewarded by Him with the greatest honours.

Catena Aurea by Aquinas ↗

Theophylact of Ohrid

He said "that you may eat and drink" not because there will be food there or because His Kingdom is a sensory one. For by His answer to the Sadducees He Himself taught that the life there is angelic (Luke 20:36); and Paul teaches that the Kingdom of God is not "food and drink" (Rom. 14:17). Therefore, hearing the words "that you may eat and drink at My table," let no one be scandalized, but let him understand that they were spoken in reference to those who enjoy honor from the kings of this world. …

Commentary on Luke ↗

Bede

That you may eat and drink at my table in my kingdom. This table is set for all the saints to enjoy; it is the heavenly glory of life. The food and drink is that of which it is said elsewhere: Blessed are those who hunger and thirst for righteousness (Matthew V), for they shall be filled. By enjoying, namely, the joy longed for and loved of the true and unwavering good. And you shall sit on thrones, judging the twelve tribes of Israel. …

On the Gospel of Luke ↗