New Revised Standard Version
We have therefore sent Judas and Silas, who themselves will tell you the same things by word of mouth.

Contemporary English Version
We are also sending Judas and Silas, who will tell you in person the same things that we are writing.

New American Bible
So we are sending Judas and Silas who will also convey this same message by word of mouth:

Douay-Rheims Bible
We have sent therefore Judas and Silas, who themselves also will, by word of mouth, tell you the same things.

We have sent therefore Judas and Silas, who themselves also will, by word of mouth, tell you the same things.

Judas.

Acts 15:22 Then it pleased the apostles and ancients, with the whole church, to choose men of their own company and to send to Antioch with Paul and Barnabas, namely, Judas, who was surnamed Barsabas, and Silas, chief men among the brethren.

who.

2 John 1:12 Having more things to write unto you, I would not by paper and ink: for I hope that I shall be with you and speak face to face, that your joy may be full.

3 John 1:13 I had many things to write unto thee: but I would not by ink and pen write to thee.

mouth.