ISB ~ John 17 v17

Sanctify them:To “sanctify” means to consecrate for a holy purpose, which here concerns the spread and preservation of divine truth. The task of the apostles is to speak the word of the Lord both orally (1 Thess 2:13; 1 Pet 1:25) and in writing (2 Thess 2:15; 1 Tim 3:14-15).

• Similar language is used in the OT for the consecration and ordination of Aaronic priests (Ex 29:1; 40:12-13). Here the disciples are set apart for “the priestly service of the gospel” (Rom 15:16) (CCC 611).