2 Corinthians 8:22
And we have sent [i.e., are sending] with them our brother [Note: This is a different person from the one mentioned in verse 18], who has often proven his diligence to us in many ways, and is now proving to be even more diligent because of the great confidence he has in you [i.e., confidence in the Corinthians completing their collection for the poor].
Philippians 2:20-22
For I do not have anyone else [i.e., as a fellow-worker] who thinks the same way I do, and who will genuinely care for your [spiritual and material] needs.
Treasury of Scripture Knowledge
Summary
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.
Whom
General references
Bible References
Whom
Philippians 2:20
For I do not have anyone else [i.e., as a fellow-worker] who thinks the same way I do, and who will genuinely care for your [spiritual and material] needs.
General references
Philemon 1:21
I am writing you, confident that you will be obedient [to my requests], and I know that you will do even more than I am asking [of you].