1 Corinthians 16:2
On the first day of the week let each one of you lay aside by himself in store as God has prospered him, that there may be no collections made when I come.
2 Corinthians 8:10
And in this case I give an opinion; for this is expedient for you, who began before to act in this matter and to act willingly a year ago.
2 Corinthians 8:12
For if there is a willing mind, a man is acceptable according to what he has, and not according to what he has not.
2 Corinthians 9:5-11
I thought it necessary, therefore, to exhort the brothers to go to you before, and to make ready your free gift before announced, that it may be ready as a free gift and not as an exaction.