Theophylact of Ohrid

And those, if they are departing from you, rebuke, that is, expose their impiety before all; but if they are disposed toward healing, do not push them away, but receive them by the mercy of your love, saving them from the fire that threatens them.

Commentary on Jude ↗

Oecumenius

And those, if they separate from you (for this is what "to distinguish" means), rebuke them, that is, make their wickedness evident to all. If they are aimed at healing, do not reject them, but receive them with your love, snatching them out of the fire that threatens them. …

Commentary on Jude ↗

Cyprian

Since, then, there is much difference between those who have sacrificed, what a want of mercy it is, and how bitter is the hardship, to associate those who have received certificates, with those who have sacrificed, when he by whom the certificate has been received may say, "I had previously read, and had been made aware by the discourse of the bishop, that we must not sacrifice to idols, that the servant of God ought not to worship images; and therefore, in order that I might not do this which was net lawful, when the opportunity of …

Epistle LI ↗

Bede

And of some have compassion, making a difference: others save with fear, pulling them out of the fire; hating even the garment spotted by the flesh, etc. What he said with fear must be joined to all three things he proposed. Because whoever reproves apostates and shows them as damnable must act in fear, lest perhaps he or his loved ones suffer something similar. And whoever rescues another from the fire of vices by chastising him, must consider himself lest he also be tempted. …

Commentary on the Catholic Epistles ↗