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Where does the Bible talk about tithing?

It is in Malachi 3:10 · King James Version

«Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me now herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it.»
Read the chapter Malachi 3 →

See also

Leviticus 27:30

And all the tithe of the land, whether of the seed of the land, or of the fruit of the tree, is the Lord’s: it is holy unto the Lord.

2 Corinthians 9:7

Every man according as he purposeth in his heart, so let him give; not grudgingly, or of necessity: for God loveth a cheerful giver.