Τὸν μὲν πρῶτον λόγον ἐποιησάμην περὶ πάντων, ὦ Θεόφιλε, ὧν ἤρξατο ὁ Ἰησοῦς ποιεῖν τε καὶ διδάσκειν,
The first word, oh Theophilus, I made about all things of which Jesus began both to do and to teach
Paraphrase: Dear Theophilus, you will remember the first book I wrote and sent to you. In that first book, I told you the story of Jesus. I wanted you to know both the things which He taught and the mighty miracles which He performed
Comments:
ἄχρι ἧς ἡμέρας ἐντειλάμενος τοῖς ἀποστόλοις διὰ Πνεύματος Ἁγίου οὓς ἐξελέξατο ἀνελήμφθη·
until which day, giving command to the apostles through the Holy Spirit which He had chosen, He was taken up.
Paraphrase: until the day of His ascension. On this day, Jesus was taken up into heaven in victory having accomplished the work He had come to perform. Jesus did not leave without giving His disciples careful instructions about the path forward. Just as Jesus had chosen these men to carry on the work which He had begun (Luke 6:13), so now He renewed the promise which He had given them before (John 14:26; 15:26; 20:22) that the disciples would receive power from the Holy Spirit Himself to perform the mandate which He was giving them.
Comments:
ἐκλέγομαι is deponent. Is ἐντέλλω? All the forms in the NT are passive. Robertson says it is a middle. source
The number and gender of οὓς agrees with ἀποστόλοις which is the antecedent of the relative pronoun. The case of οὓς is determined by the fact that it is the object of ἐξελέξατο.
Kuyper sees three distinct acts of the Holy Spirit in regards to the apostles:
that of saving grace in regeneration and subsequent illumination—Matt. 16:17.
official gifts qualifying them for the apostolic office—John 20:22.
the Baptism with the Holy Ghost—Acts 1:5 in connection with Acts 2:1ff. source
οἷς καὶ παρέστησεν ἑαυτὸν ζῶντα μετὰ τὸ παθεῖν αὐτὸν ἐν πολλοῖς τεκμηρίοις, δι’ ἡμερῶν τεσσεράκοντα ὀπτανόμενος αὐτοῖς καὶ λέγων τὰ περὶ τῆς βασιλείας τοῦ Θεοῦ·
καὶ συναλιζόμενος παρήγγειλεν αὐτοῖς ἀπὸ Ἱεροσολύμων μὴ χωρίζεσθαι, ἀλλὰ περιμένειν τὴν ἐπαγγελίαν τοῦ Πατρὸς ἣν ἠκούσατέ μου·
ὅτι Ἰωάνης μὲν ἐβάπτισεν ὕδατι, ὑμεῖς δὲ ἐν Πνεύματι βαπτισθήσεσθε Ἁγίῳ οὐ μετὰ πολλὰς ταύτας ἡμέρας.