Theophylact of Ohrid

The disciples are inflamed with zeal, and unsheath their swords. But whence have they swords? Because they had slain the lamb, and had departed from the feast. Now the other disciples ask whether they should strike; but Peter, always fervent in defence of his Master, waits not for permission, but straightway strikes the servant of the High Priest; as it follows, And one of them smote, &c.

Catena Aurea by Aquinas ↗

Augustine of Hippo

Now Luke says, But Jesus answered and said, Suffer ye thus far; which is what Matthew records, Put thy sword up into its sheath. Nor will it move you as contrary thereto, that Luke says here that our Lord answered, Suffer ye thus far, as if He had so spoken after the blow to show that what was done had pleased Him so far, but He did not wish it to proceed farther, seeing that in these words which Matthew has given, it may rather be implied that the whole circumstance in which Peter used the sword was …

Catena Aurea by Aquinas ↗

Bede

Seeing what was to happen, those around him said: Lord, shall we strike with the sword? And one of them struck the servant of the high priest and cut off his right ear. Peter did this, as the evangelist John teaches, with the same fervor of mind with which he had done other things. For he knew how Phinehas received the reward of righteousness and everlasting priesthood by punishing the sacrilegious. What follows:

On the Gospel of Luke ↗

Bonaventure

Second, as to the zeal of the disciples he adds: But those who were around him, seeing what was about to happen, said to him: Lord, shall we strike with the sword? For the disciples, kindled with zeal of love for Christ, were inflamed for his defense, but they hesitated on account of what they had been taught by him — to show all patience, according to that of Matthew 5: "Whoever strikes you on one cheek, offer him the other also"; but Peter was so fervent that he neither asked nor waited for a response.

Commentary on Luke, Chapter 22 ↗