2 Corinthians 8:7-8

7But just as you excel in everything, [and lead the way] in faith, in speech, in knowledge, in genuine concern, and in your love for us, see that you excel in this gracious work [of giving] also.

8I am not saying this as a command [to dictate to you], but to prove, by [pointing out] the enthusiasm of others, the sincerity of your love as well.