John 15:15

οὐκέτι. No longer do I call you servants (see on John 8:34 and comp. John 14:30. He had implied that they were His servants John 12:26 and stated it John 13:13-16. The two relationships do not exclude one another. He had called them φίλοι before this (Luke 12:4); and they did not cease to be His δοῦλοι after this (Romans 1:10; 2 Peter 1:1; Revelation 1:1).

ὑμᾶς δὲ εἴρ. But you have I called friends; because all things that I heard from My Father I made known to you: as they were able to bear it (John 16:12). After Pentecost they would be able to bear much more. Thus he who wills to do his will as a servant shall know of the doctrine as a friend (John 7:17).