1 Corinthians 16:2
On the first day of the week let each one of you lay by with himself treasuring up, that as to whatsoever he may be prospered, in order that there may be no collections at that time when I may come.
2 Corinthians 8:10
And herein I give my judgement: for this is profitable to you, who not only began to do, but to be anxious, a year ago:
2 Corinthians 8:12
For if there is first a willing mind, it is acceptable according to what one may have, and not according to what he has not.
2 Corinthians 9:5-11
Therefore I considered it necessary to exhort the brethren, that they may come to you beforehand, and perfect your preannounced benefaction, that it may be ready, as a benefaction, not as a stingy contribution.