John Chrysostom

Then to prove that Christ is the cause of the days of refreshing, he says, "And He shall send Jesus Christ, which before was for you ordained." He said not, "That your sin may be blotted out," but, "your sins;" for he hints at that sin also. "He shall send." And whence? "Whom the heaven must receive." Still "receive?" And why not simply, Whom the heaven hath received? This, as if discoursing of old times: so, he says, it is divinely ordered, so it is settled: not a word yet of His eternal subsistence.

Homily on Acts 9 ↗

Athanasius of Alexandria

If the blessed Peter speak of the Divine Word also, as sent to the children of Israel by Jesus Christ, it is not necessary to understand that the Word is one and Christ another, but that they were one and the same by reason of the uniting which took place in His divine and loving condescension and becoming man. And even if He be considered in two ways, still it is without any division of the Word, as when the inspired John says, 'And the Word became flesh, and dwelt among us.' ...And how can Christ be called a mere man? …

Four Discourses Against the Arians, Discourse 4, Sections 31 & 33 ↗

Theophylact of Ohrid

"That He may send the Jesus Christ appointed for you, whom heaven must receive until the times of the restoration of all things." Peter says this instead of saying: "It is necessary for heaven to receive Him, since He is God and must always sit together with the Father." He shows the reason why He does not come now, saying that everything must come to an end, and then He too will come.

Commentary on Acts ↗