I sanctify myself - I consecrate myself exclusively to the service of God. The word "sanctify" does not refer here to personal sanctification, for he had no sin, but to setting himself apart entirely to the work of redemption.

That they also ... -

1. That they might have an example of the proper manner of laboring in the ministry, and might learn of me how to discharge its duties. Ministers will understand their work best when they most faithfully study the example of their great model, the Son of God.

2. That they might be made pure by the effect of my sanctifying myself - that is, that they might be made pure by the shedding of that blood which cleanses from all sin. By this only can men be made holy; and it was because the Saviour so sanctified himself, or set himself to this work so unreservedly as to shed his own blood, that any soul can be made pure and fit for the kingdom of God.

I sanctify myself - I consecrate and devote myself to death - that I may thereby purchase eternal salvation for them. There seems to be here an allusion to the entering of the high priest into the holy of holies, when, having offered the sacrifice, he sprinkled the blood before the ark of the covenant. So Jesus entered into the holiest of all by his own blood, in order to obtain everlasting redemption for men: see Hebrews 9:11-13. The word, ἁγιαζω, to consecrate or sanctify, is used in the sense of devoting to death, in Jeremiah 12:3, both in the Hebrew and in the Septuagint: the Hebrew קדש signifies also to sacrifice.

And for their sakes I sanctify myself,.... Which is to be understood, not of his making himself holy; for he never was a sinner, and so stood in no need of sanctification: he was made like unto us, yet without sin; he looked like a sinner, but was not one; he was traduced, charged, and treated as such, but was perfectly holy, and free from all sin; he was essentially and infinitely holy as God; and as man, he was holy in his conception and birth; he was filled with the Holy Ghost, and was holy in his life and in his death: rather this may be meant of his being separated, and set apart for his office as Mediator, which, though done by the Father, and is ascribed unto him, John 10:36; yet may also be attributed to himself; since he voluntarily devoted himself to this work, and cheerfully accepted of it: though it seems best to understand it of his offering himself a sacrifice for, and in the room and stead of his people, in allusion to the offerings under the law, the sacrificing of which is expressed by sanctifying, Exodus 13:2; and because his sacrifice was an Holy One: what he sanctified or offered was "himself": not his divine, but human nature, his body and his soul; and these as in union with his divine person; which gives his sacrifice the preference to all others, and is the true reason of its virtue and efficacy; and this is expressive of his great love. He himself is also the sanctifier or offerer, which shows him to be a priest, and that he had a power over his own life, and that he sacrificed it voluntarily; and this he is said to do at that present time, because the time was very near that he was to be offered up, and his present prayer and intercession were a part of his priestly office. This he did not for his own sake, nor for the sake of angels, nor for all men, but for his disciples, as distinct from the world; and not for the apostles only, but for all that the Father had given to him; and that as their substitute and surety, in their room and stead:

that they also might be sanctified through the truth; that is, have all their sins expiated, and they be cleansed from all the guilt and filth of them, through Christ himself and his sacrifice, who is the truth; or "in truth"; as it may be rendered, really and truly, in opposition to the legal sacrifices which atoned for sin, not really, only typically; or through the. Gospel of truth, bringing the good news of atonement by the blood and sacrifice of Christ, and which the Spirit of God seals to the conscience with comfort and joy.

And for their sakes I sanctify myself, that they also might be sanctified through the {g} truth.

(g) The true and substantial sanctification of Christ is contrasted with the outward purifyings of the law.

17:19 For their sakes I sanctify myself. He did this when he came into the world, when he made it his meat to do the Father's will, and when he gave himself to death. We sanctify ourselves when we present our bodies as living sacrifice (Ro 12:1).

17:19 I sanctify myself - I devote myself as a victim, to be sacrificed.

sanctified...: or, truly sanctified

19. And for their sakes I sanctify-consecrate.

myself that they also might-may.

be sanctified-consecrated. The only difference between the application of the same term to Christ and the disciples is, as applied to Christ, that it means only to "consecrate"; whereas, in application to the disciples, it means to consecrate with the additional idea of previous sanctification, since nothing but what is holy can be presented as an offering. The whole self-sacrificing work of the disciples appears here as a mere result of the offering of Christ [Olshausen].

through-in.

the truth-Though the article is wanting in the original here, we are not to translate, as in the Margin, "truly sanctified"; for the reference seems plainly to be "the truth" mentioned in Joh 17:17. (See on [1883]Joh 17:17).

17:17-19 Christ next prayed for the disciples, that they might not only be kept from evil, but made good. It is the prayer of Jesus for all that are his, that they may be made holy. Even disciples must pray for sanctifying grace. The means of giving this grace is, through thy truth, thy word is truth. Sanctify them, set them apart for thyself and thy service. Own them in the office; let thy hand go with them. Jesus entirely devoted himself to his undertaking, and all the parts of it, especially the offering up himself without spot unto God, by the eternal Spirit. The real holiness of all true Christians is the fruit of Christ's death, by which the gift of the Holy Ghost was purchased; he gave himself for his church, to sanctify it. If our views have not this effect on us, they are not Divine truth, or we do not receive them by a living and a working faith, but as mere notions.