Malachi 3:8-10

You people are robbing me, your God. And, here you are, asking, “How are we robbing you?” You are robbing me of the offerings and of the ten per cent that belongs to me. That's why your whole nation is under a curse. I am the LORD All-Powerful, and I challenge you to put me to the test. Bring the entire ten per cent into the storehouse, so there will be food in my house. Then I will open the windows of heaven and flood you with blessing after blessing.