Jude 1:5

“I will therefore put you in remembrance, though ye once know this, etc.] The Alexandrian copy, and some others, and the Vulgate Latin version, read, “knew all things”; but rather it is to be restrained by the following instance of, God's vengeance on unbelievers; which with others is produced, to vindicate the divine conduct in the condemnation of the above persons, and to show that that is certain, and may be expected, since God has always dealt thus with such persons; and this they knew by reading of the Scriptures; at least they had known it once, though it might now be forgotten by them; and they had known it once for all; they had been perfectly acquainted with it; which is said, lest…”

“(Heb 3:16; Heb 4:13.) therefore--Other oldest manuscripts and Vulgate read, "But"; in contrast to the ungodly Jde 1:4. though ye once--rather, "once for all." Translate, "I wish to remind you, as knowing ALL (namely, that I am referring to; so the oldest manuscripts, versions, and Fathers) once for all." As already they know all the facts once for all, he needs only to "remind" them. the Lord--The oldest manuscripts and versions read, "Jesus." So "Christ" is said to have accompanied the Israelites in the wilderness; so perfectly is Jesus one with the God of the Israelite theocracy. saved--brought safely, and into a state of safety and salvation. afterward--Greek, "secondly"; in the next…”

“I will therefore put you in remembrance - “To show you what must be the doom of such men, I will call certain facts to your recollection, with which you are familiar, respecting the Divine treatment of the wicked in times past.” Though ye once knew this - That is, you were formerly made acquainted with these things, though they may not be now fresh in your recollection. On the different significations affixed to the word “once” in this place, see Bloomfield, “Crit. Digest, in loc.” The thing which seems to have been in the mind of the apostle was an intention to call to their recollection, as bearing on the case before him, facts with which they had formerly been familiar, and about which…”

“He afterwards destroyed - The far greater part of that very people whom he had once saved. Let none therefore presume upon past mercies, as if he was now out of danger. Jude 1:6”

“1:5-16 This section elaborates on the “condemnation recorded long ago” (1:4) by applying to the false teachers Old Testament examples of God’s judgment. 1:5 The preexistent Jesus rescued the people of Israel from Egypt and later destroyed the unfaithful (cp. 1 Cor 10:4). • After rescuing the nation of Israel from Egypt, God led them toward the Promised Land. Most of the people did not trust the Lord to protect them. Because of their unbelief, God sentenced that generation (except Joshua and Caleb) to wander in the wilderness until they died (see Num 14).”

“put: Rom 15:15; Pe2 1:12, Pe2 1:13, Pe2 3:1 having: Co1 10:1-12 afterward: Num. 14:22-37, Num 26:64, Num 26:65; Deu 2:15, Deu 2:16; Psa 106:26; Heb 3:16-19, Heb 4:1, Heb 4:2 Jude 1:6”