Can you give me chapter and verse where the bible textually says that?

The concept of tithing is first mentioned in Genesis 14:20, where Abraham gives a tenth of the spoils from a battle to Melchizedek, the king of Salem. In the Old Testament, there are several references to tithing, including the following: Deuteronomy 14:22-29: “You shall tithe all the yield of your seed that comes from the field year by year. And before the LORD your God, in the place that he will choose, to make his name dwell there, you shall eat the tithe of your grain, of your wine, and of your oil, and the firstborn of your herd and flock, that you may learn to fear the LORD your God always.” Proverbs 3:9-10: “Honor the LORD with your wealth and with the firstfruits of all your produce; then your barns will be filled with plenty, and your vats will be bursting with wine.” Malachi 3:10: “Bring the full tithe into the storehouse, that there may be food in my house. And thereby put me to the test, says the LORD of hosts, if I will not open the windows of heaven for you and pour down for you a blessing until there is no more need.” These verses show that, according to the Bible, the tithe is to be given to support the local church.