All of John Chapter 17 is a prayer by Jesus to the Father (He is the mediator).  v1-5 is for himself, v6-19 is for the disciples, and v20-26 are for all future believers.  Topics covered include Glorifying the Son and Glorifying the Father as a reciprocal relationship, and how it’s an example for us, Jesus passing on God’s teachings to the Disciples, Sanctification, Clean and Unclean, Common and Holy, and God’s long-term plan for Unity.

1 These words spake Jesus, and lifted up his eyes to heaven, and said, Father, the hour is come; glorify thy Son, that thy Son also may glorify thee:
2 As thou hast given him power over all flesh, that he should give eternal life to as many as thou hast given him.
3 And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.
4 I have glorified thee on the earth: I have finished the work which thou gavest me to do.
5 And now, O Father, glorify thou me with thine own self with the glory which I had with thee before the world was. John 17:1-5

6 I have manifested thy name unto the men which thou gavest me out of the world: thine they were, and thou gavest them me; and they have kept thy word.
7 Now they have known that all things whatsoever thou hast given me are of thee.
8 For I have given unto them the words which thou gavest me; and they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me. 

16 They are not of the world, even as I am not of the world.
17 Sanctify them through thy truth: thy word is truth.
18 As thou hast sent me into the world, even so have I also sent them into the world.
19 And for their sakes I sanctify myself, that they also might be sanctified through the truth. John 17: 16-19

Here’s a talk from Bible teacher, David Pawson. This is basically Leviticus summed up nice and simple (consecrate = sanctify).  One additional note here is that Unclean cannot be in the presence of Holy.