1 Peter 5:13-14

The church that is at Babylon saluteth you See the preface. The word church is not in the original, but it is supplied in the Syriac, Vulgate, and other ancient versions, and by Œcumenius. Probably, as Beza observes, Peter omitted it as being a word of common use, which, in such a connection, would be easily supplied in the reader's mind. There being many Jews remaining in Babylon, and in the country adjacent, ever since the captivity, and Peter being the apostle of the Jews, it is likely he went thither to preach the gospel to them, and so planted a church among them. Elected together with you Συνεκλεκτη, co-elect, that is, a branch of God's chosen people, as all true believers are. See on 1 Peter 1:2. And Marcus my son So he calls him, because he had been converted by his ministry. With the family, of which he was a member, Peter was well acquainted, as may be gathered from his going immediately to the house of Mary, Mark's mother, after he was miraculously brought out of prison by the angel, Acts 12:12. See more concerning him, Acts 13:5; Colossians 4:10; 2 Timothy 4:11. It is believed by many that he was the author of the gospel called by his name; this, however, is not certain. See the preface to that gospel.