KJV: 23 Gaius mine host, and of the whole church, saluteth you. Erastus the chamberlain of the city saluteth you, and Quartus a brother. 24 The grace of our Lord Jesus Christ be with you all. Amen.

NIV 23 Gaius, whose hospitality I and the whole church here enjoy, sends you his greetings. Erastus, who is the city’s director of public works, and our brother Quartus send you their greetings. [24]

ESV 23 Gaius, who is host to me and to the whole church, greets you. Erastus, the city treasurer, and our brother Quartus, greet you.

CSB: 23 Gaius, who is host to me and to the whole church, greets you. Erastus, the city treasurer, and our brother Quartus greet you.

Explanation

A stereotypical ending was added similar to others in Paul's writing.

1 Corinthians 16:23 The grace of the Lord Jesus be with you.

2 Corinthians 13:14 May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.

Galatians 6:18 The grace of our Lord Jesus Christ be with your spirit, brothers and sisters. Amen.

Philippians 4:23  The grace of the Lord Jesus Christ be with your spirit. Amen.

1 Thessalonians 5:28 The grace of our Lord Jesus Christ be with you.