KJV:
And we have sent with him the brother, whose praise is in the gospel throughout all the churches;
NASB:
We have sent along with him the brother whose fame in the things of the gospel has spread through all the churches;
KJV:
And we have sent with them our brother, whom we have oftentimes proved diligent in many things, but now much more diligent, upon the great confidence which I have in you.
NASB:
We have sent with them our brother, whom we have often tested and found diligent in many things, but now even more diligent because of his great confidence in you.