John 17:19 New English Translation

¹⁹And I set myself apart^[a] on their behalf,^[b] so that they too may be truly set apart.^[c]

John 17:19 tn Or “I sanctify.”sn In what sense does Jesus refer to his own ‘sanctification’ with the phrase I set myself apart? In 10:36 Jesus referred to himself as “the one whom the Father sanctified and sent into the world,” which seems to look at something already accomplished. Here, however, it is something he does on behalf of the disciples (on their behalf) and this suggests a reference to his impending death on the cross. There is in fact a Johannine wordplay here based on slightly different meanings for the Greek verb translated set apart (ἁγιάζω, hagiazō). In the sense it was used in 10:36 of Jesus and in 17:17 and here to refer to the disciples, it means to set apart in the sense that prophets (cf. Jer 1:5) and priests (Exod 40:13, Lev 8:30, and 2 Chr 5:11) were consecrated (or set apart) to perform their tasks. But when Jesus speaks of setting himself apart (consecrating or dedicating himself) on behalf of the disciples here in 17:19 the meaning is closer to the consecration of a sacrificial animal (Deut 15:19). Jesus is “setting himself apart,” i.e., dedicating himself, to do the will of the Father, that is, to go to the cross on the disciples’ behalf (and of course on behalf of their successors as well).
John 17:19 tn Or “for their sake.”
John 17:19 tn Or “they may be truly consecrated,” or “they may be truly sanctified.”

New English Translation (NET)