Malachi 3:7-9
Even from the days of your fathers ye are gone away from mine ordinances, and have not kept them. Return unto me, and I will return unto you, saith the LORD of hosts. But ye said, Wherein shall we return?
Will a man rob God? Yet ye have robbed me. But ye say, Wherein have we robbed thee? In tithes and offerings.
Ye are cursed with a curse: for ye have robbed me, even this whole nation.
When you don't pay your tithes and give your offerings, you are s robber.