Not quite what the modern, money-hungry preachers teach about the tithe . . .

‘When thou hast made an end of tithing all the tithes of thine increase THE THIRD YEAR, [which is] the YEAR OF TITHING, and hast GIVEN [IT] UNTO THE LEVITE, THE STRANGER, THE FATHERLESS, AND THE WIDOW, that they may eat within thy gates, and be filled;

Then thou shalt say before the LORD thy God, I have brought away the hallowed things out of [mine] house, and also have given them unto the Levite, and unto the stranger, to the fatherless, and to the widow, according to all thy commandments which thou hast commanded me: I have not transgressed thy commandments, neither have I forgotten [them] . . . ‘

(Deut. 26:12-13)

This passage is referring back to the Biblical guidelines for tithing, given in the Old Testament, as part of The Law of Moses:

‘Thou shalt truly tithe all the increase of thy seed, that the field bringeth forth year by year.

And thou shalt eat before the LORD thy God, in the place which he shall choose to place his name there, the tithe of thy corn, of thy wine, and of thine oil, and the firstlings of thy herds and of thy flocks; that thou mayest learn to fear the LORD thy God always.

And if the way be too long for thee, so that thou art not able to carry it; [or] if the place be too far from thee, which the LORD thy God shall choose to set his name there, when the LORD thy God hath blessed thee: Then shalt thou turn [it] into money, and bind up the money in thine hand, and shalt go unto the place which the LORD thy God shall choose:  And thou shalt bestow that money for whatsoever thy soul lusteth after, for oxen, or for sheep, or for wine, or for strong drink, or for whatsoever thy soul desireth: and thou shalt eat there before the LORD thy God, and thou shalt rejoice, thou, and thine household,

And the Levite that [is] within thy gates; thou shalt not forsake him; for he hath no part nor inheritance with thee.

At the end of three years thou shalt bring forth all the tithe of thine increase the same year, and shalt lay [it] up within thy gates: And the Levite, (because he hath no part nor inheritance with thee,) and the stranger, and the fatherless, and the widow, which [are] within thy gates, shall come, and shall eat and be satisfied; that the LORD thy God may bless thee in all the work of thine hand which thou doest.’  (Deut. 14:22-29)

Who knew that tithes were brought and used for a great big, generous feast every third year?!

The tithe is not commanded for Gentile Christians.  You will find no instructions pertaining to it in the New Testament.  But now, as in all things, we should look to the Holy Spirit and The Word, to guide us in keeping the SPIRIT (rather than the letter) of The Law. 

More on the tithe (so you can have a balanced and informed understanding) can be found in Leviticus 27:30-33, Numbers 18, Deuteronomy 12, 2 Chronicles 31, Nehemiah 10:28-39, 12:44-47.