John 15:25

Their law] i.e. their Scriptures (see John 10:34). The passage alluded to is Psalms 69:4 : cp. Psalms 35:11. David is the person hated, but David's case is typical of Christ's.

26, 27. The Witness of the Holy Spirit and of the Apostles to Christ.
26. The Comforter] see on John 14:16. Whom I will send] According to John 14:17; John 14:26, it is the Father who sends the Spirit; now it is Christ Himself, showing clearly that 'what things soever the Father doeth, these also doeth the Son likewise' (John 5:19). Cp. Luke 24:49; Acts 2:33, and see on John 16:7. Which proceedeth from the Father] The Eastern Church uses this text to prove the eternal procession of the Holy Ghost from the Father alone, but the preposition used shows that not the eternal origin, but the temporal mission of the Comforter is meant. He (the masculine pronoun emphasises the Spirit's personality: cp. John 14:26) shall testify of me] by His whole working in the Church from Pentecost onward: see on John 16:8.