Albert Barnes Commentary 2 Corinthians 8:3

"For according to their power, I bear witness, yea and beyond their power, [they gave] of their own accord," — 2 Corinthians 8:3 (ASV)

For to their power. To the utmost of their ability.

I bear record. Paul had founded those churches and had spent much time with them. He was therefore well qualified to bear testimony regarding their condition.

Yea, and beyond their power. Beyond what could have been expected, or beyond what would have been thought possible in their condition. Doddridge remarks that this is a noble hyperbole, similar to that used by Demosthenes when he says, "I have performed all, even with an industry beyond my power." The meaning is that they were willing to give more than they were well able. This shows the strong interest they had in this matter and the eager desire they had to relieve the needs of others.

Of themselves, auyairetoi. Acting from choice; self-moved; voluntarily; of their own accord. They did not wait to be urged or pressed to do it. They rejoiced in the opportunity of doing it. They came forward of their own accord and made the contribution. As it is written, God loveth a cheerful giver (2 Corinthians 9:7). And from all the accounts we have of these churches in Macedonia, it is evident that they were greatly distinguished for their cheerful liberality.