Men and brethren, let me speak freely to you of the patriarch David, that he is both dead and buried, and his tomb is with us to this day. Therefore, being a prophet, and knowing that God had sworn with an oath to him that of the fruit of his body, according to the flesh, He would raise up the Christ to sit on his throne, he, foreseeing this, spoke concerning the resurrection of the Christ, that His soul was not left in Hades, nor did His flesh see corruption. This Jesus God has raised up, of which we are all witnesses. Therefore being exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He poured out this which you now see and hear. (Acts 2:29–32)
Observe how, at the beginning of his discourse, he does not say that Jesus Himself had sent Him, but the Father: now, however, that he has mentioned His signs and the things done to Him by the Jews, and has spoken of His resurrection, he boldly introduces what he has to say about these matters, again adducing themselves as witnesses by both senses: which you now see and hear. And of the resurrection, he has made continual mention, but of their outrageous deed he has spoken once for all. And having received from the Father the promise of the Holy Spirit. This again is great. The promise, he says: because before His Passion. Observe how he now makes it all His, covertly making a great point. For if it was He that poured it forth, it is of Him that the Prophet has spoken above, In the last days I will pour forth of My Spirit on My servants, and on My handmaids, and I will do wonders in the heaven above. Observe what he secretly puts into it! But then, because it was a great thing, he again veils it with the expression of His having received of the Father. He has spoken of the good things fulfilled, of the signs; has said, that He is king, the point that touched them; has said, that it is He that gives the Spirit. (For, however much a person may say, if it does not issue in something advantageous, he speaks to no purpose.) Just as John: The Same, says he, shall baptize you with the Holy Spirit. And it shows that the Cross not only did not make Him less, but rendered Him even more illustrious, seeing that of old God promised it to Him, but now has given it. Or the promise which He promised to us. He so foreknew it about to be and has given it to us greater after the resurrection. And, has poured Him out, he says; not requiring worthiness: and not simply given, but with abundance.
John Chrysostom, Homilies on the Acts of the Apostles 6