Malachi 3:7-8

3:7 From the days of your ancestors you have ignored my commandments and have not kept them! Return to me, and I will return to you,” says the Lord who rules over all. “But you say, ‘How should we return?’ 3:8 Can a person rob God? You indeed are robbing me, but you say, ‘How are we robbing you?’ In tithes and contributions!