2 Corinthians 8:24
"Wherefore shew ye to them, and before the churches, the proof of your love, and of our boasting on your behalf."
Cross References (ranked by relevance)
2 Corinthians 7:14
For if I have boasted any thing to him of you, I am not ashamed; but as we spake all things to you in truth, even so our boasting, which I made before Titus, is found a truth.
2 Corinthians 7:4
Great is my boldness of speech toward you, great is my glorying of you: I am filled with comfort, I am exceeding joyful in all our tribulation.
2 Corinthians 8:8
I speak not by commandment, but by occasion of the forwardness of others, and to prove the sincerity of your love.