Tithing is the practical and consistent way that we put God first in our lives and develop healthy spiritual habits. If I say, “Jesus You are my Lord and God; You are first in my life,” and then put Him last in my budget, that's a contradiction that cannot be justified in light of scripture. Tithing is the tangible way that we put God first in our lives and clearly establish our priorities and whom we are serving.
“Bring this tithe to the designated place of worship—the place the Lord your God chooses for his name to be honored—and eat it there in his presence. This applies to your tithes of grain, new wine, olive oil, and the firstborn males of your flocks and herds. Doing this will teach you always to fear the Lord your God.” Deuteronomy 14:23 (NLT)
Tithing is the spiritual practice of giving back to God the first 10% of all that we earn. The word “tithe” comes from the number "ten" in Hebrew, and means a tenth. For every $10, I earn or receive, the first dollar belongs to the Lord.
“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!” Malachi 3:10 (NLT)