3 But I am sending the brothers in order that our boasting about you in this matter should not prove hollow, but that you may be ready, as I said you would be.

Read 2 Corinthians 9:3 Using Other Translations

Yet have I sent the brethren, lest our boasting of you should be in vain in this behalf; that, as I said, ye may be ready:
But I am sending the brothers so that our boasting about you may not prove empty in this matter, so that you may be ready, as I said you would be.
But I am sending these brothers to be sure you really are ready, as I have been telling them, and that your money is all collected. I don’t want to be wrong in my boasting about you.