John 16:8

And when he is come
The coming of the Spirit here, chiefly designs his descent upon the apostles, at the day of "Pentecost": as the things ascribed to him, and which were then done by him, clearly show; though it may also include his coming along with, and by the ministration of the Gospel, into the hearts of his people at conversion, in all after ages of time:

he will reprove the world of sin, of righteousness, and of judgment:
by "the world" is principally meant, the Jews; the world among whom Christ personally was, who knew him not, disbelieved him, rejected him as the Messiah, hated and persecuted him, even unto death; though not to the exclusion of the Gentiles, the whole world that lies in wickedness; since both joined, and were concerned in these things, and reproved of them; which "reproving", as it may respect different persons, may intend both such reproofs and convictions, as are not attended with conversion, and issue in salvation; and such as are powerful, spiritual, and to saving purposes: the several things the Spirit of God is said to reprove of, being repeated in the following verses, with reasons or specifications annexed to them, will be there considered.