John Chrysostom
After saying, "but wait for the promise of the Father, which you have heard from Me," He added, "for John truly baptized with water, but you shall be baptized with the Holy Spirit not many days from now."
Here at last He shows the difference between Himself and John, and no longer obscurely as before. Earlier He had greatly veiled His speech, saying, "he who is least in the Kingdom of Heaven is greater than he" (Mt 11:11).
But now He speaks much more clearly: "John baptized with water, but you shall be baptized with the Holy Spirit."
He no longer cites John's testimony itself (Mt 3:11-12), but only points to his person. By this He recalls what John had said.
He also shows that they had already become greater than John, since they themselves would baptize with the Spirit.
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He did not say, "I baptize you with the Holy Spirit," but, "you shall be baptized," teaching us humility.
That He Himself baptized was already evident from John's testimony, for John said, "He will baptize you with the Holy Spirit and fire" (Lk 3:16). Therefore Christ mentioned John alone.
Thus the Gospels narrate what Christ did and said, while Acts narrates what the other Comforter said and did.
Of course, the Holy Spirit had performed many things before, just as Christ acts now and acted before. But before He acted through the temple, while now He acts through the apostles.
Then He entered the virginal womb and formed a temple there. Now He enters the souls of the apostles.
Then He descended in the form of a dove, now in the form of fire. Why so?
There He showed meekness; here He shows severity, fittingly reminding us of judgment. When sins had to be forgiven, great meekness was needed.
But once we have received this gift, it is already the time of judgment and examination.
Why does Christ say, "you shall be baptized," when there was no water in the upper room? Because the chief thing in baptism is the Spirit, through whom the water also acts.
In the same way Christ Himself is said to have been anointed, although He was never anointed with oil, but received the Holy Spirit.
However, one may also find that they were baptized with water, and that this happened at different times.
With us both baptisms, by water and by the Spirit, take place together, but then they were separate.
At the beginning they were baptized by John, and this is not surprising. If harlots and tax collectors came to that baptism, much more would those come who afterward were to be baptized with the Holy Spirit.
Then, lest they say, "All this is still only a promise," since He had spoken about it many times before, and lest they think it could not be fulfilled, He turns them from such a supposition by the words, "not many days from now."
He did not declare exactly when, so that they would always keep watch. He said that it would be soon, so that they would not grow faint.
Yet He did not add exactly when, so that they would always be vigilant.
He assures them not only by the shortness of the time, but also by the words, "which you have heard from Me" (Acts 1:4).
His words mean: I have not told you this only now. I promised it already before, and I will certainly fulfill it.
Why, then, do you wonder that He did not tell the day of the world's end, when He did not wish to reveal even this day, though it was so near?
He did this quite naturally, so that they would always keep watch, wait, and take care.