John 15:3

Now ye are clean - Καθαροι εστε, Ye are pruned. As our Lord has not changed the metaphor, it would be wrong to change the expression.

Through the word - Δια τον λογον, Through that word - that doctrine of holiness which I have incessantly preached unto you, and which ye have received. Perhaps our Lord more immediately refers here to the words which he had spoken concerning Judas, John 13:21-30, in consequence of which Judas went out and finished his bargain with the chief priests; he being gone off, the body of the apostles was purified; and thus he might say, Now ye are clean through the word which I have spoken unto you.

Now ye are clean - Still keeping up the figure καθαροί katharoi. It does not mean that they were perfect, but that they had been under a process of purifying by his instructions all the time he had been with them. He had removed their erroneous notions of the Messiah; he had gradually reclaimed them from their fond and foolish views respecting earthly honors; he had taught them to be willing to forsake all things; and he had so trained and disciplined them that immediately after his death they would be ready to go and bear fruit among all nations to the honor of his name. In addition to this, Judas had been removed from their number, and they were now all true followers of the Saviour. See the notes at John 13:10.

Through the word - By means of the teachings of Jesus while he had been with them.

15:3 Ye are clean - All of you, to whom I now speak, are purged from the guilt and power of sin; by the word - Which, applied by the Spirit, is the grand instrument of purifying the soul.