‏ Acts 1:2

 Until the day in which ( αχρ ης ημερας ). Incorporation of the antecedent into the relative clause and the change of case  η (locative) to  ης (genitive).

 Was received up ( ανελημπθη ). First aorist passive indicative of  αναλαμβανω. Common verb to lift anything up (Ac 10:16) or person as Paul (Ac 20:13). Several times of the Ascension of Jesus to heaven (Mr 16:19; Ac 1:2, 11, 22; 1Ti 3:16) with or without "into heaven" ( εις τον ουρανον ). This same verb is used of Elijah's translation to heaven in the LXX (2Ki 2:11). The same idea, though not this word, is in Lu 24:51. See Lu 9:51 for  αναλημψις of the Ascension.

 Had given commandment ( εντειλαμενος ). First aorist middle participle of  εντελλω (from  εν and  τελλω, to accomplish), usually in the middle, old verb, to enjoin. This special commandment refers directly to what we call the commission given the apostles before Christ ascended on high (Joh 20:21-23; Mt 28:16-20; Mr 16:15-18; 1Co 15:6; Lu 24:44-49). He had given commands to them when they were first chosen and when they were sent out on the tour of Galilee, but the immediate reference is as above.

 Through the Holy Spirit ( δια πνευματος αγιου ). In his human life Jesus was under the guidance of the Holy Spirit. This applies to the choice of the apostles (Lu 6:13) and to these special commands before the Ascension.

 Whom he had chosen ( ους εξελεξατο ). Aorist middle indicative, not past perfect. The same verb ( εκλεξαμενος ) was used by Luke in describing the choice of the twelve by Jesus (Lu 6:13). But the aorist does not stand "for" our English pluperfect as Hackett says. That is explaining Greek by English. The Western text here adds: "And ordered to proclaim the gospel."

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