Malachi 3:7-10 (NLT)
(7) Ever since the days of your ancestors, you have scorned my decrees and failed to obey them. Now return to me, and I will return to you,” says the Lord of Heaven’s Armies. “But you ask, ‘How can we return when we have never gone away?’ (8) “Should people cheat God? Yet you have cheated me! “But you ask, ‘What do you mean? When did we ever cheat you?’ “You have cheated me of the tithes and offerings due to me. (9) You are under a curse, for your whole nation has been cheating me. (10) Bring all the tithes into the storehouse so there will be enough food in my Temple. If you do,” says the Lord of Heaven’s Armies, “I will open the windows of heaven for you. I will pour out a blessing so great you won’t have enough room to take it in! Try it! Put me to the test!"
The scripture is clear that you can test God on this one thing...give your tithe and He "will pour out a blessing so great you won't have enough room to take it in!"