Acts 9

of this way

that were of The Way, i.e. Christ. John 14:6.
me?

The Lord identifies Himself with His people.
voice

Cf Acts 22:9; 26:14.

A contradiction has been imagined. The three statements should be taken together. The men heard the "voice" as a sound ( (Greek - ἀναφωνέω), but did not hear the "voice" as articulating the words, "Saul, Saul," etc).
that he is the Son of God

Cf. Acts 2:36. Peter, while maintaining the deity of Jesus--"God hath made that same Jesus, whom ye have crucified, both Lord and Christ"--gives especial prominence to His Messiahship. Paul, fresh from the vision of the glory, puts the emphasis on His Deity. Peter's charge was that the Jews had crucified the Son of David Acts 2:25-30 Paul's that they had crucified the Lord of glory 1 Corinthians 2:8. In the A.V. the sense is largely lost. The point was, not that the Christ was God, a truth plainly taught by Isaiah. ; Isaiah 7:14; 9:6,7 but that Jesus, the crucified Nazarene, was the Christ and therefore God the Son.
But Saul

It seems probable that Acts 9:22-25 refer to Paul's labours in Damascus after his return from Arabia Galatians 1:17.

The "many days" of verse Acts 9:23 may represent the "three years" of Galatians 1:18, which intervened between Paul's return to Damascus and his visit to Peter.
gone to Jerusalem

The Acts records four visits of Paul to Jerusalem after conversion:

Grecians

Hellenists, i.e. Grecian Jews.
Dorcas

i.e. gazelle.
widows

Contra, Acts 6:1.

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