Men and brethren, children of the stock of Abraham, and whosoever among you feareth God, to you is the word of this salvation sent. Men and brethren - This should have been translated brethren simply. See the note on Acts 7:2.
Children of the stock of Abraham - All ye that are Jews.
And whosoever among you feared God - That is, all ye who are Gentiles, and are now proselytes to the Jewish religion.
The word of this salvation - The doctrine that contains the promise of deliverance from sin, and the means by which it is brought about; all which is founded on Jesus, of the stock of David, dying and rising again for the salvation of Jews and Gentiles.