The church that is at Babylon, elected together with you, saluteth you; and so doth Marcus my son. The Church that is at Babylon - After considering all that has been said by learned men and critics on this place, I am quite of opinion that the apostle does not mean Babylon in Egypt, nor Jerusalem, nor Rome as figurative Babylon, but the ancient celebrated Babylon in Assyria, which was, as Dr. Benson observes, the metropolis of the eastern dispersion of the Jews; but as I have said so much on this subject in the preface, I beg leave to refer the reader to that place.
Instead of Babylon, some MSS. mentioned by Syncellus in his Chronicon have Ιοππῃ, Joppa; and one has Ῥωμῃ, Rome, in the margin, probably as the meaning, according to the writer, of the word Babylon.
Elected together with you - Συνεκλεκτη· Fellow elect, or elected jointly with you. Probably meaning that they, and the believers at Babylon, received the Gospel about the same time. On the election of those to whom St. Peter wrote, see the notes on 1 Peter 1:2.
And ...Marcus my son - This is supposed to be the same person who is mentioned Acts 12:12, and who is known by the name of John Mark; he was sister's son to Barnabas, Colossians 4:10, his mother's name was Mary, and he is the same who wrote the gospel that goes under his name. He is called here Peter's son, i.e. according to the faith, Peter having been probably the means of his conversion. This is very likely, as Peter seems to have been intimate at his mother's house. See the account, Acts 12:6-17.