Malachi 3:8-10 — “ ‘Will a man rob God? Yet you rob me. But you ask, “How do we rob you?” In tithes and offerings. You are under a curse—the whole nation of you—because you are robbing me. Bring the whole tithe into the storehouse, that there may be food in my house. Test me in this,’ says the Lord Almighty, ‘and see if I will not throw open the floodgates of heaven and pour out so much blessing that you will not have room enough for it.’ ” 
 

2 Corinthians 9:6-9 — “Remember this: Whoever sows sparingly will also reap sparingly, and whoever sows generously will also reap generously. Each man should give what he has decided in his heart to give, not reluctantly or under compulsion, for God loves a cheerful giver. And God is able to make all grace abound to you, so that in all things at all times, having all that you need, you will abound in every good work. As it is written: ‘He has scattered abroad his gifts to the poor; his righteousness endures forever.’ ” [quoting Psalms 112:9]