The Apostle Paul
2 Corinthians 8:21ESV·traditional attribution

for we aim at what is honorable not only in the Lord’s sight but also in the sight of man.

John Calvin Reformed @genevareformer

21. Providing things honest I am of opinion, that there were not wanting, even among the Corinthians, some who would have proceeded so far as to revile, if occasion had been allowed them. Hence he wished them to know the state of matters, that he might shut the mouths of all everywhere.

Matthew Henry Presbyterian @wholebiblehenry

In these verses the apostle commends the brethren who were sent to them to collect their charity; and as it were, gives them letters credential, that, if they were enquired after (Co2 8:23), if any should be inquisitive or suspicious concerning them, it might be known who they were and how safely they might be trusted. I. He commends Titus, 1.

Commenting on 2 Corinthians 8:16-24

John Gill Reformed Baptist @doctorgill

And we have sent with him our brother,.... This is a third person sent about this business. The apostle, in this, conformed to the customs of his nation; at least if he did not purposely do it, it agrees with the Jewish canons, which require three persons for the distribution of alms.