Albert Barnes Commentary 2 Corinthians 9:3

"But I have sent the brethren, that our glorying on your behalf may not be made void in this respect; that, even as I said, ye may be prepared:" — 2 Corinthians 9:3 (ASV)

Yet have I sent the brethren. The brethren referred to in 2 Corinthians 8:18, 22, 23.

Lest our boasting of you. That you were disposed to contribute, and that you were already prepared, and that the contribution was ready.

Should be in vain. Lest anything should have occurred to prevent the collection. I have sent them so that they may facilitate it, and that it may be secure and certain.

In this behalf. In this respect. That is, lest our boasting of you, in regard to your readiness to contribute to relieve the wants of others, should be found to have been ill-grounded.