1 Corinthians 16:2
On the first day of every week, each one of you is to put something aside and store it up, as he may prosper, so that no collections be made when I come.
2 Corinthians 8:10
And in this matter I give my advice: it is best for you now to complete what a year ago you began not only to do but to desire.
2 Corinthians 8:12
For if the readiness is there, it is acceptable according to what a man has, not according to what he does not have.
2 Corinthians 9:5-11
So I thought it necessary to urge the brethren to go on to you before me, and arrange in advance for this gift you have promised, so that it may be ready not as an exaction but as a willing gift.