Consider John’s sending Christology and missiological implications for us today:
“In John’s sending christology, the sent one is to know the sender intimately (7:29; cf. 15:21; 17:8, 25); live in a close relationship with the sender (8:16, 18, 29; 16:32); bring glory and honour to the sender (5:23; 7:18); do the sender’s will (4:34; 5:30, 38; 6:38-39) and works (5:36; 9:4); speak the sender’s words (3:34; 7:16; 12:49; 14:10b, 24); follow the sender’s example (13:16); be accountable to the sender (passim; cf. esp. ch. 17); bear witness to the sender (12:44-45; 13:20; 15:18-25); and exercise delegated authority (5:21-22, 27; 13:3; 17:2; 20:23). John goes to great lengths to show that Jesus fulfilled all the functions of a sent one perfectly. He does so in part for the purpose of presenting Jesus as a model for his disciples to follow. When Jesus commissions his followers (20:21), he functions, for the first time in the Fourth Gospel, not as the sent one, but as the one who sends others. Like Jesus, his disciples are to fulfill the manifold functions of one sent as outlined above.”
– Andreas J. Kostenberger and Peter T. O’Brien, Salvation to the Ends of the Earth: A Biblical Theology of Mission (Downer’s Grove, IL: InterVarsity, 2001), 209.