Sowing and reaping in the context of giving: God will do this.
6 Now this: the one who sows sparingly will also reap sparingly, and the one who sows bountifully will also reap bountifully. 7 Each one should give as he has decided in his heart, not reluctantly or from compulsion, for God loves a cheerful giver. 8 And God is able to cause all grace to abound to you, so that in everything at all times, having enough of everything, you may overflow in every good work.
2 Corinthians 9:6–8