John 17:19

And for their sakes I sanctify myself, that they also might be sanctified through the truth.
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Cornelius a Lapide

AD 1637
And for their sakes I sanctify Myself, that they also might be sanctified through the truth1st S. Augustine uses the word sanctify in its proper sense. I as the Son of God sanctify human nature which I have assumed, that by it I may sanctify the Apostles. As S. Augustine says, "When the Word was made flesh, He sanctified Himself in Himself; Himself the Prayer of Manasseh , in Himself the Word, because the Word and the Man is one Christ. But He says it for the sake of His members; and for these I sanctify Myself, that Isaiah , them in Me, because in Me they are even Myself. That they also might be sanctified. What meaneth this, "that they too," but that they may be sanctified even as I, and in the Truth which I Myself am?" 2d, and correctly, "I offer Myself to Thee as a Holy Victim," i.e, within a few hours I shall offer It upon the Cross, so that they may by It "be sanctified in the truth," that Isaiah , that by Thy word which is truth, and no shadow, they may be sanctified, be truly ...

Cyril of Alexandria

AD 444
And if we may sum up in brief the whole matter, Christ called down upon us the ancient gift of humanity, that is, sanctification through the Spirit and communion with the Divine Nature, His disciples being the first to receive it; for the saying is true, that the husbandman that laboureth must be the first to partake of the fruits. But that He might herein also indeed have the preeminence (for it was meet that He, being, as it were, one of many brethren, and still Man even as we are men, should, through being in our likeness, be seen to be and in fact be the Beginning, and the Gate, and the Way, of every good thing for us), He is impelled to add what follows, namely, the words: For their sakes I sanctify Myself. And, indeed, the saying is hard to explain and difficult to understand. Still, the Word Which maketh all things clear, and discovereth deep things out of darkness, will reveal to us even this mystery. That which is brought by any one to God by way of an offering or gift, as ...

George Leo Haydock

AD 1849
And for them do I sanctify myself. St. Augustine expounds it, I sanctify them, who are my members, in myself. The interpretation of St. Chrysostom and St. Cyril, seems preferable, that to sanctify in the style of Scriptures, is oftentimes the same as to offer up a sacrifice: so the sense here is, I sacrifice, and offer up myself on the cross for them and all mankind. (Witham) By this Christ shews, that he sanctified the apostles, by sanctifying himself; because they are the members of his body. (St. Augustine, tract. 107. in Joan.) Or, according to St. Chrysostom, I offer myself up to be the victim in their behalf. For victims, and whatever is dedicated to God, are called holy. He, their head, was offered up, and they also are immolated, according to that of the apostle, Romans xii. Exhibit your members a living sacrifice, holy (St. Chrysostom, hom. lxxxi. in Joan.)

John Chrysostom

AD 407
What is, I sanctify Myself? I offer to You a sacrifice. Now all sacrifices are called holy, and those are specially called holy things, which are laid up for God. For whereas of old in type the sanctification was by the sheep, but now it is not in type, but by the truth itself, He therefore says, That they may be sanctified in Your truth. For I both dedicate them to You, and make them an offering; this He says, either because their Head was being made so, or because they also were sacrificed; for, Present, it says, your bodies a living sacrifice, holy Romans 12:1; and, We were counted as sheep for the slaughter. Psalm 43:22 And He makes them; without death, a sacrifice and offering; for that He alluded to His own sacrifice, when He said, I sanctify, is clear from what follows.

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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