2 Corinthians 8

 As Paul addresses the need for donations to those living in poverty in Jerusalem, he wrote - 

" I speak not by commandment, but by occasion of the forwardness of others, and to prove the sincerity of your love.

9 For ye know the grace of our Lord Jesus Christ, that, though he was rich, yet for your sakes he became poor, that ye through his poverty might be rich."  (2 Corinthians 8:8–9)

"For I mean not that other men be eased, and ye burdened:

14 But by an equality, that now at this time your abundance may be a supply for their want, that their abundance also may be a supply for your want: that there may be equality:

15 As it is written, He that had gathered much had nothing over; and he that had gathered little had no lack."  (2 Corinthians 8:13–15)

"But this I say, He which soweth sparingly shall reap also sparingly; and he which soweth bountifully shall reap also bountifully."  (2 Corinthians 9:6)

Sounds much like fast offerings of our day.