John 17:17
“As You have sent Me into the world, even so have I also sent them into the world.”
As Paul also says, “Having put in us the word of reconciliation.” For the same end for which Christ came, for the same did these take possession of the world. In this place again the “as” is not put to signify resemblance in the case of Himself and the Apostles; for how was it possible for men to be sent otherwise? But it was His custom to speak of the future as having come to pass.
Source: Homilies on the Gospel of John (New Advent)