King James Version (KJV) Authorized Version 1611
Read Full Chapter (John 17)

John 17:19-21 KJV

"And for their sakes I sanctify myself, that they also might be sanctified through the truth. Neither pray I for these alone, but for them also which shall believe on me through their word; That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me."
John Chapter 17, Verse 19-21

John 17:19-21 in Context (Verses 16–24 KJV)

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.
20
Neither pray I for these alone, but for them also which shall believe on me through their word;
21
That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.
22
And the glory which thou gavest me I have given them; that they may be one, even as we are one:
23
I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.
24
Father, I will that they also, whom thou hast given me, be with me where I am; that they may behold my glory, which thou hast given me: for thou lovedst me before the foundation of the world.