1 Now concerning the ministering to the saints, it is superfluous for me to write to you; 2 for I know your willingness, about which I boast of you to the Macedonians, that Achaia was ready a year ago; and your zeal has stirred up the majority.
This section shows how the initial Corinthian motivation to give spurred the Macedonians to the north to give. The difference lay in diligence to complete the project. The Macedonians finished before the Corinthians. Paul gave the reason he sent the team to collect funds for the Jerusalem church ahead of his coming.
Now concerning the ministering [service] to the saints [in Jerusalem],
Chapter 9 continues the argument of chapter 8. The word “saints” communicates the idea of a group of people God set apart as His own; that is, Christians.
it is superfluous for me to write to you;
There was no need for Paul to go into great detail about the collection for the saints in Jerusalem because it was not a new issue to the Corinthians.
for I know your willingness,
Paul gave the Corinthians an opportunity to demonstrate the authenticity of their commitment to donate to the impoverished Jerusalem church.
about which I boast of you to the Macedonians [northern Greece],
Paul boasted about the Corinthians giving to the Macedonians (2 Co 8:1-5), but the apostle himself became an issue in the church in the interim. This slowed their collection for Jerusalem.
that Achaia [southern Greece] was ready [prepared] a year ago;
“Achaia” is the southern province where Corinth was located. The Corinthian church had been ready for a year to contribute to the offering. There was no question about their willingness to give.
and your zeal has stirred up [stimulated] the majority.
The Corinthians’ original desire to give encouraged other churches to contribute.
A promise to give is biblical.
There is nothing wrong with asking people to promise to give to the Lord’s work. There is no demand for how much to give in a promise, only the commitment to provide what one promises. We promise to pay our credit card each month. There is nothing unbiblical about churches announcing the amount of their giving to a cause.