Malachi 3:7-8

7“Since the days of your ancestors, you have turned from my statutes; you have not kept them. Return to me, and I will return to you,” says the Lord of Armies. Yet you ask, “How can we return?”

8“Will a man rob God? Yet you are robbing me!” “How do we rob you?” you ask. “By not making the payments of the tenth and the contributions.