"Until the day in which He was taken up, after that He, through the Holy Spirit, had given commandments unto the Apostles whom He had chosen. After He had given commandments through the Spirit;" i.e. they were spiritual words that He spake unto them, nothing human; either this is the meaning, or, that it was by the Spirit that He gave them commandments. Do you observe in what low terms he still speaks of Christ, as in fact Christ had spoken of Himself? "But if I by the Spirit of God cast out devils;" for indeed the Holy Ghost wrought in that Temple. Well, what did He command? "Go ye therefore," He says, "make disciples of all the nations, baptizing them into the Name of the Father, and of the Son, and of the Holy Ghost; teaching them to observe all things whatsoever I have commanded you." A high encomium this for the Apostles; to have such a charge entrusted to them, I mean, the salvation of the world! words full of the Spirit! And this the writer hints at in the expression, "through the Holy Ghost" (and, "the words which I spake unto you," saith the Lord, "are Spirit") thus leading the hearer on to a desire of learning what the commands were, and establishing the authority of the Apostles, seeing it is the words of the Spirit they are about to speak, and the commandments of Christ. "After He had given commandments," he says, "He was taken up." He does not say, "ascended;" he still speaks as concerning a man. It appears then that He also taught the Disciples after His resurrection, but of this space of time no one has related to us the whole in detail. St. John indeed, as also does the present writer, dwells at greater length on this subject than the others; but none has clearly related every thing (for they hastened to something else); however, we have learnt these things through the Apostles, for what they heard, that did they tell.
instructing the Apostles, whom he had chosen through the Holy Spirit: Observe the order (In Matt. 28:19) of these injunctions. He bids the Apostles first to teach all nations, then to wash them with the sacrament of faith, and after faith and baptism then to teach them what things they ought to observe; Teaching them to observe all things whatsoever I have commanded you.
Until the day on which he was taken up, after giving instructions through the Holy Spirit to the apostles whom he had chosen. By hyperbaton it is to be read until the day on which he was taken up, commanding before the assumption, that is, giving precepts to the apostles which are read either here or in the Gospels. The sense therefore is: I wrote about Jesus from the time he began to perform signs and teach until the day on which, having completed these things, he returned to where he had come from.
[AD 407] John Chrysostom on Acts 1:2